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Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Accounts receivable $ 1,164 $ 1,162
Less: allowance for credit losses (61) (62)
Net trade receivables 1,103 1,100
Unbilled receivables 245 226
Miscellaneous receivables 206 202
Receivables, net $ 1,554 $ 1,528