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Balance Sheet and Cash Flows Supplemental Information - Additional Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Supplemental non cash information:    
Financing activities - Acquisition of noncontrolling interest $ 125 $ 0
Capital expenditures acquired but not yet paid $ 28 $ 37