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Commitments And Contingencies (Lessee Disclosures) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2019
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract | 40 years |  | 40 years |  |  |
Lease, Cost [Abstract] |  |  |  |  |  |
Operating Lease, Cost | $ 14 | $ 14 | $ 26 | $ 26 |  |
Finance Lease, Right-of-Use Asset, Amortization | 2 | 0 | 3 | 0 |  |
Interest Expense | 0 | 0 | 1 | 0 |  |
Short-term Lease, Cost | 1 | 1 | 2 | 2 |  |
Operating Lease, Expense | 1 | 1 | 2 | 2 |  |
Sublease Income | (10) | (11) | (20) | (21) |  |
Lease, Cost | $ 8 | $ 5 | $ 14 | 9 |  |
Lease Term and Discount Rate [Abstract] |  |  |  |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 24 years |  | 24 years |  |  | 24 years
Finance Lease, Weighted Average Remaining Lease Term | 5 years |  | 5 years |  |  | 10 years
Cash Flow, Operating Activities, Lessee [Abstract] |  |  |  |  |  |
Operating cash flows from operating leases |  |  | $ (26) | (28) |  |
Operating cash flows from finance leases |  |  | 0 | 0 |  |
Financing cash flows from finance leases |  |  | (3) | 0 |  |
Leased assets obtained in exchange for new finance lease liabilities |  |  | 0 | 0 |  |
Leased assets obtained in exchange for new operating lease liabilities |  |  | 9 | $ 14 |  |
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract] |  |  |  |  |  |
Operating lease - 2020 (remainder) | $ 25 |  | 25 |  |  |
Operating lease - 2022 | 48 |  | 48 |  |  |
Operating lease - 2023 | 46 |  | 46 |  |  |
Operating lease - Thereafter | 840 |  | 840 |  |  |
Total lease payment | 1,048 |  | 1,048 |  |  |
Less: interest | (505) |  | (505) |  |  |
Present value of lease liabilities - operating leases | 543 |  | 543 |  |  |
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract] |  |  |  |  |  |
Finance lease - 2020 (remainder) | 4 |  | 4 |  |  |
Finance lease - 2022 | 7 |  | 7 |  |  |
Finance lease - 2023 | 7 |  | 7 |  |  |
Finance lease - 2024 | 7 |  | 7 |  |  |
Finance lease - Thereafter | 5 |  | 5 |  |  |
Total lease payment | 34 |  | 34 |  |  |
Less: interest | (5) |  | (5) |  |  |
Present value of lease liabilities - finance leases | 29 |  | 29 |  | $ 32 |
Maturity of lease liabilities [Abstract] |  |  |  |  |  |
2020 (remainder) | 29 |  | 29 |  |  |
2021 | 55 |  | 55 |  |  |
2022 | 53 |  | 53 |  |  |
2023 | 52 |  | 52 |  |  |
2024 | 48 |  | 48 |  |  |
Thereafter | 845 |  | 845 |  |  |
Total lease payment | 1,082 |  | 1,082 |  |  |
Less: interest | (510) |  | (510) |  |  |
Present value of lease liabilities | 572 |  | 572 |  |  |
Lessee, Operating Lease, Liability, to be Paid, Year Five | 44 |  | 44 |  |  |
Finance Lease, Liability, to be Paid, Year Five | $ 4 |  | $ 4 |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 6.00% |  | 6.00% |  |  | 6.00%
Finance Lease, Weighted Average Discount Rate, Percent | 5.00% |  | 5.00% |  |  | 8.00%
Lessee, Operating Lease, Liability, to be Paid, Year Five | $ 45 |  | $ 45 |  |  |
Minimum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract | 5 years |  | 5 years |  |  |
Lessee, Operating Lease, Renewal Term | 1 year |  | 1 year |  |  |
Maximum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract | 15 years |  | 15 years |  |  |
Lessee, Operating Lease, Renewal Term | 20 years |  | 20 years |  |  |

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