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Accounts Receivable, Net and Customer Contract Related Liabilities - Provision for Credit Losses Rollforward (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 282 $ 324
Accounts receivable, provision for credit loss, period increase 35 11
Accounts receivable, provision for credit loss, writeoff (34) (44)
Accounts receivable, provision for credit loss, recovery 0 1
Accounts receivable, provision for credit loss, foreign exchange (3) 2
Ending balance $ 280 $ 294