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Leases - Supplemental Cash Flow (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows for operating leases $ 389 $ 329
Operating cash flows for finance leases 4 4
Financing cash flows for finance leases 233 151
Lease liabilities arising from obtaining right-of-use assets:    
Operating leases 539 1,282
Finance leases $ 52 $ 24