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Description of Business and Significant Accounting Policies - Out of Period Adjustments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Income tax benefit     $ (55) $ 48 $ (98)
Misapplication of Accounting Guidance Related to Recognition of Income Tax Expense [Member]          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Income tax benefit $ 5 $ 15