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Income Taxes - Income Tax Adjustments, Settlements and Unusual Items (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Income Tax Adjustments, Settlements and Unusual Items $ (13)    
Valuation Allowance, Deferred Tax Asset, Change in Amount 9    
American Taxpayer Relief Act [Member]      
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Income Tax Adjustments, Settlements and Unusual Items   $ (16)  
Tax Planning Strategy [Member]      
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Income Tax Adjustments, Settlements and Unusual Items   (10)  
CANADA      
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Income Tax Adjustments, Settlements and Unusual Items (10)    
JAPAN      
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Valuation Allowance, Deferred Tax Asset, Change in Amount   15  
Maximum [Member]      
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound 15    
Minimum [Member]      
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound 10    
Pension Plan [Member]      
Income Tax Settlements, Adjustments and Unusual Items [Line Items]      
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements $ (427) $ 1 $ 0