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Equity Stock Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended 75 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items]      
Stock Repurchased During Period, Shares 8.7   154.3
Stock Repurchased During Period, Value $ 79 $ 408 $ 1,900
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 264   $ 264
Treasury Stock Acquired, Average Cost Per Share     $ 12.12