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Leases - Supplemental cash flow information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]    
Operating cash flows for operating leases $ 60 $ 24
Financing cash flows for finance leases 2 1
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 31 22
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 15 $ 2