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Consolidated Statement of Changes in Equity (Parenthetical) (Private Forward Repurchase Transaction [Member], USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Private Forward Repurchase Transaction [Member]
     
Consolidated Statement of Changes in Equity (Textuals) [Abstract]      
Private forward repurchase contract $ 500 $ 200 $ 150
Common stock repurchased, shares 11,000,000 6,000,000 6,000,000