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Leases (Schedule of Aggregate Lease Maturities) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Future Minimum Lease Payments For Operating Leases [Abstract] |  |
Minimum operating lease payments - 2020 | $ 147 |
Minimum operating lease payments - 2021 | 302 |
Minimum operating lease payments - 2022 | 267 |
Minimum operating lease payments - 2023 | 226 |
Minimum operating lease payments - 2024 | 216 |
Minimum operating lease payments - later years | 777 |
Total operating lease payments | 1,935 |
Operating lease payments - amount representing interest | 270 |
Operating lease liabilities - present value of minimum lease liabilities | 1,665 |
Future Minimum Lease Payments For Finance Leases [Abstract] |  |
Minimum finance lease payments - 2020 | 84 |
Minimum finance lease payments - 2021 | 142 |
Minimum finance lease payments - 2022 | 127 |
Minimum finance lease payments - 2023 | 88 |
Minimum finance lease payments - 2024 | 75 |
Minimum finance lease payments - later years | 124 |
Total finance lease payments | 640 |
Finance lease payments - amount representing interest | 88 |
Finance lease liabilities - present value of minimum lease liabilities | 552 |
Minimum lease payments - 2020 | 231 |
Minimum lease payments - 2021 | 444 |
Minimum lease payments - 2022 | 394 |
Minimum lease payments - 2023 | 314 |
Minimum lease payments - 2024 | 291 |
Minimum lease payments - later years | 901 |
Total minimum lease payments | 2,575 |
Lease payments - amount representing interest | 358 |
Total lease liabilities | $ 2,217 | $ 2,438

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