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Leases (Future Minimum Payments for Operating Leases) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Leases [Abstract] |  |
Remainder of 2021 | $ 308 |
2022 | 381 |
2023 | 332 |
2024 | 289 |
2025 | 257 |
2026 | 235 |
Subsequent years | 678 |
Total future lease payments | 2,480 |
Less: Imputed interest | (288) |
Total | 2,192 |
Current lease liabilities | 342 | $ 342
Long-term lease liabilities | $ 1,850 | $ 1,924

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