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Long-Term Debt and Interest Rate Swap Arrangements (Debt) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2013
7.125% Senior Secured Notes due 2017
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Dec. 31, 2012
7.125% Senior Secured Notes due 2017
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Dec. 31, 2011
7.125% Senior Secured Notes due 2017
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Mar. 23, 2010
7.125% Senior Secured Notes due 2017
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Mar. 31, 2013
7.5% Senior Secured Notes due 2019, net of original issue discount
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Dec. 31, 2012
7.5% Senior Secured Notes due 2019, net of original issue discount
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Dec. 31, 2011
7.5% Senior Secured Notes due 2019, net of original issue discount
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Sep. 25, 2009
7.5% Senior Secured Notes due 2019, net of original issue discount
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Mar. 31, 2013
7.375% Senior Secured Notes due 2020
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Dec. 31, 2012
7.375% Senior Secured Notes due 2020
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Dec. 31, 2011
7.375% Senior Secured Notes due 2020
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Mar. 23, 2010
7.375% Senior Secured Notes due 2020
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Mar. 31, 2013
5.125% Senior Secured Notes due 2022
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Dec. 31, 2012
5.125% Senior Secured Notes due 2022
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Jul. 02, 2012
5.125% Senior Secured Notes due 2022
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Mar. 31, 2013
4.375% Senior Secured Notes due 2023, net of original issue discount
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Dec. 31, 2012
4.375% Senior Secured Notes due 2023, net of original issue discount
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Mar. 31, 2013
5.95% Senior Secured Notes due 2043, net of original issue discount
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Dec. 31, 2012
5.95% Senior Secured Notes due 2043, net of original issue discount
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Mar. 31, 2013
Senior secured credit facility
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Dec. 31, 2012
Senior secured credit facility
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Dec. 31, 2011
Senior secured credit facility
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Mar. 31, 2013
Capital lease obligations
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Dec. 31, 2012
Capital lease obligations
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Dec. 31, 2011
Capital lease obligations
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||
| Debt and capital lease obligations | $ 3,596 | $ 3,477 | $ 2,490 | $ 376 | $ 500 | $ 500 | $ 500 | $ 760 | $ 988 | $ 986 | $ 1,000 | $ 500 | $ 500 | $ 500 | $ 500 | $ 500 | $ 500 | $ 500 | $ 750 | $ 0 | $ 300 | $ 0 | $ 328 | $ 903 | $ 434 | $ 82 | $ 86 | $ 70 |
| Current portion of debt and capital lease obligations | (11) | (12) | (10) | |||||||||||||||||||||||||
| Long-term portion of debt and capital lease obligations | $ 3,585 | $ 3,465 | $ 2,480 |