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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) gal | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) gal | Sep. 30, 2019 USD ($)
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 18 |  | $ 18 |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 51 | $ (37) | 61 | $ (36)
Interest Rate Caps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | 8,552 |  | 8,552 |
Interest Rate Caps [Member] | Subsidiaries [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | 3,000 |  | 3,000 |
Interest Rate Swaps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | 1,950 |  | 1,950 |
Currency Swap [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | $ 1,309 |  | $ 1,309 |
Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Units Of Gasoline | gal | 5 |  | 5 |
Purchase [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | $ 2,800 |  | $ 2,800 |
Sold [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | 5,800 |  | 5,800 |
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (1) | 1 | 6 | (3)
Interest Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (10) | 9 | 18 | (20)
Operating Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 2 | $ (1) | $ (4) | $ (1)

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