Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details)

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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]  
Balance at January 1, 2013 $ 95
Decreases related to prior year tax positions (11)
Increases related to current year tax positions 12
Settlements (7)
Balance at December 31, 2013 $ 89