Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]      
Cash contributions to defined contribution plans $ 19 $ 16 $ 16