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Income Taxes (Unaudited) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule Of Income Taxes [Line Items]        
International operations $ (215) $ (67) $ (382) $ (155)
U.S. operationsa (29) 49 (22) 38
Total (186) $ (116) $ (360) (193)
Income Tax Credits and Adjustments       36
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       $ 1,500
Effective Income Tax Rate, Adjusted, Percent       33.00%
Consolidated effective income tax rate (percent)     38.00% (5.00%)
Minimum Tax Credit Carryforwards [Member]        
Schedule Of Income Taxes [Line Items]        
Income Tax Credits and Adjustments $ (32)   $ (31)