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Leases (Schedule of Aggregate Lease Maturities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Future Minimum Lease Payments For Operating Leases [Abstract] |  |
Minimum operating lease payments - 2021 | $ 325 |
Minimum operating lease payments - 2022 | 273 |
Minimum operating lease payments - 2023 | 229 |
Minimum operating lease payments - 2024 | 220 |
Minimum operating lease payments - 2025 | 216 |
Minimum operating lease payments - later years | 567 |
Total operating lease payments | 1,830 |
Operating lease paymetns - amount representing interest | (226) |
Operating lease liabilities - present value of minimum lease liabilities | 1,604 |
Future Minimum Lease Payments For Finance Leases [Abstract] |  |
Minimum finance lease payments - 2021 | 135 |
Minimum finance lease payments - 2022 | 111 |
Minimum finance lease payments - 2023 | 81 |
Minimum finance lease payments - 2024 | 68 |
Minimum finance lease payments - 2025 | 45 |
Minimum finance lease payments - later years | 77 |
Total finance lease payments | 517 |
Finance lease payments - amount representing interest | (68) |
Finance lease liabilities - present value of minimum lease liabilities | 449 |
Minimum lease payments - 2021 | 460 |
Minimum lease payments - 2022 | 384 |
Minimum lease payments - 2023 | 310 |
Minimum lease payments - 2024 | 288 |
Minimum lease payments - 2025 | 261 |
Minimum lease payments - later years | 644 |
Total minimum lease payments | 2,347 |
Lease payments - amount representing interest | (294) |
Total lease liabilities | $ 2,053 | $ 2,438

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- Definition Amount of required minimum payments for leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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