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Schedule II: Valuation and Qualifying Accounts (Details) - Allowance for doubtful accounts and sales credits - 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 Year $ 296 $ 225 $ 631
Additions 942 579 1,240
Usage (771) (508) (1,646)
Balance at End of Year $ 467 $ 296 $ 225