Other Assets - Intangible Assets Disclosure (Detail) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying value | $ 1,960 | $ 2,188 |
| Accumulated amortization | (1,542) | (1,558) |
| Net carrying value | 418 | 630 |
| Customer Lists [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying value | 1,460 | 1,478 |
| Accumulated amortization | (1,130) | (1,089) |
| Net carrying value | 330 | 389 |
| Acquired leases and other [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying value | 500 | 710 |
| Accumulated amortization | (412) | (469) |
| Net carrying value | $ 88 | $ 241 |