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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 160 $ 154 $ 73
Charged to Costs and Expenses 57 5 76
Acquisition Impact 0 24 45
Charged to Other Accounts/Other 0 0 0
Deductions (32) (23) (40)
Balance at End of Period $ 185 $ 160 $ 154