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Description of Business and Significant Accounting Policies - Out of Period Adjustments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Income tax benefit $ (92) $ (55) $ 48
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