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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]          
Effective tax rate on income from operations 25.00%   26.00%    
Effective income tax rate, estimated     24.00%    
U.S. statutory federal rate, expected (benefit) provision     35.00%    
U.S. taxes on foreign unremitted earnings     (7.00%)    
Noncontrolling interests     (10.00%)    
Deferred Tax Assets, Valuation Allowance $ 526   $ 526   $ 538
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (13) $ 10 (12) $ 32  
Liability for Uncertain Tax Positions, Noncurrent 235   235   $ 228
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Unrecognized Tax Benefits, Period Increase (Decrease) $ 8 $ (3) $ 7    
Maximum [Member]          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Unrecognized Tax Benefits, Period Increase (Decrease)       $ 1