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Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Receivables [Abstract]    
Accounts receivable $ 1,316 $ 1,297
Less: allowance for credit losses (62) (59)
Net trade receivables 1,254 1,238
Unbilled receivables 338 294
Miscellaneous receivables 276 251
Receivables, net $ 1,868 $ 1,783