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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Depreciation and fixed asset basis differences, Assets | $ 0 | $ 0
Allowances for professional liability and other risks, Assets | 376 | 355
Accounts receivable, Assets | 307 | 274
Compensation, Assets | 292 | 256
Right-of-use lease obligations | 369 | 0
Other, Assets | 461 | 424
Deferred tax assets | 1,805 | 1,309
Depreciation and fixed asset basis differences, Liabilities | 601 | 340
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 | 366 | 0
Other, Liabilities | 538 | 491
Deferred tax liabilities | $ 1,505 | $ 831

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