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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 19 |
Document Period End Date | Dec. 31, 2020 |
Interest Rate Caps Sold |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | $ 6,000 | $ 5,900
Purchase [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 2,900 | 2,700
Interest Rate Cap [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 8,871 | 8,625
Interest Rate Cap [Member] | Subsidiary Issuers |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 3,100 | 3,200
Interest Rate Swap [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 1,950 | 1,500
Currency Swap [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | $ 1,386 | $ 1,518

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