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Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Accounts receivable $ 1,194 $ 1,162
Less: allowance for credit losses (64) (62)
Net trade receivables 1,130 1,100
Unbilled receivables 254 226
Miscellaneous receivables 220 202
Receivables, net $ 1,604 $ 1,528