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Leases - Maturity of Lease Liabilities (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Operating Leases  
Remainder of 2021 $ 29
2022 310
2023 284
2024 238
2025 189
Thereafter 2,109
Total undiscounted lease payments 3,159
Less: imputed interest (1,503)
Total lease liabilities 1,656
Finance Lease Excluding Finance Obligation  
Lessee, Lease, Description [Line Items]  
Remainder of 2021 47
2022 145
2023 44
2024 17
2025 1
Thereafter 0
Total undiscounted lease payments 254
Less: imputed interest (11)
Total lease liabilities $ 243