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Leases - Maturities (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Leases |  |  |
Operating lease cost | $ 132 | $ 129 | $ 134
Finance lease cost | 48 |  |
Operating |  |  |
2020 | 63 |  |
2021 | 58 |  |
2022 | 57 |  |
2023 | 51 |  |
2024 | 40 |  |
Thereafter | 359 |  |
Total lease payments | 628 |  |
Less: interest | (183) |  |
Discounted lease liabilities | 445 |  |
Operating leases not yet commenced | $ 26 |  |
Operating leases not yet commenced term | 15 years |  |
Financing |  |  |
2020 | $ 47 |  |
2021 | 45 |  |
2022 | 45 |  |
2023 | 44 |  |
2024 | 41 |  |
Thereafter | 256 |  |
Total lease payments | 478 |  |
Less: interest | (119) |  |
Discounted lease liabilities | $ 359 |  |

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