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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Depreciation and fixed asset basis differences, Assets | $ 0 | $ 0
Allowances for professional liability and other risks, Assets | 426 | 407
Accounts receivable, Assets | 348 | 283
Compensation, Assets | 502 | 487
Right-of-use lease obligations | 428 | 416
Other, Assets | 499 | 485
Deferred tax assets | 2,203 | 2,078
Depreciation and fixed asset basis differences, Liabilities | 737 | 678
Allowances for professional liability and other risks, Liabilities | 0 | 0
Accounts receivable, Liabilities | 0 | 0
Compensation, Liabilities | 0 | 0
Right-of-use lease assets and obligations | 419 | 409
Other, Liabilities | 652 | 606
Deferred tax liabilities | $ 1,808 | $ 1,693

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