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Commitments and Contingencies - Lessee Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Lessee, Operating Lease, Term of Contract 40 years  
Lease, Cost [Abstract]    
Operating lease cost $ 53  
Finance lease cost - Amortization of leased assets 4  
Finance lease cost - Interest expense 1  
Short term lease cost 3  
Variable lease cost 5  
Sublease income (43)  
Net lease cost $ 23  
Lease Term and Discount Rate Abstract [Abstract]    
Operating leases 25 years  
Finance leases 5 years  
Operating leases 6.00%  
Finance leases 5.00%  
Cash paid for amount included in the measurement of lease liabilities    
Operating cash flows from operating leases $ (52)  
Operating cash flows from finance leases (1)  
Financing cash flows from finance leases (4)  
Leased assets obtained in exchange for new finance lease liabilities 28  
Leased assets obtained in exchange for new operating lease liabilities 20  
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]    
Operating lease - 2020 51  
Operating lease - 2021 48  
Operating lease - 2022 46  
Operating lease - 2023 44  
Operating lease - 2024 43  
Operating lease - Thereafter 840  
Total lease payment 1,072  
Less: interest 522  
Present value of lease liabilities - Operating leases 550  
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract]    
Finance lease - 2020 7  
Finance lease - 2021 7  
Finance lease - 2022 7  
Finance lease - 2023 7  
Finance lease -2024 4  
Finance lease - Thereafter 5  
Total lease payment 37  
Less: interest 5  
Present value of lease liabilities - Finance leases 32 $ 1
Maturity of lease liabilities [Abstract]    
2020 58  
2021 55  
2022 53  
2023 51  
2024 47  
Thereafter 845  
Total lease payment 1,109  
Less: interest 527  
Present value of lease liabilities $ 582  
Maximum [Member]    
Lessee, Lease, Description [Line Items]    
Lessee, Operating Lease, Term of Contract 15 years  
Lessee, Operating Lease, Renewal Term 20 years  
Minimum [Member]    
Lessee, Lease, Description [Line Items]    
Lessee, Operating Lease, Term of Contract 5 years  
Lessee, Operating Lease, Renewal Term 1 year