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Income Taxes (Unaudited) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Consolidated effective income tax rate (percent) (2.00%) 23.00%
U.S. operations $ 11 $ 835
International operations (88) (121)
Total (77) 714
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 1,400 $ 458
Effective Income Tax Rate, Adjusted, Percent 34.00% 37.00%