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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) gal | Mar. 31, 2019 USD ($)
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ (14) |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (13) | $ (12)
Interest Rate Caps [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 8,192 |
Interest Rate Caps [Member] | Subsidiaries [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 3,000 |
Interest Rate Swaps [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 2,250 |
Currency Swap [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | $ 1,685 |
Commodity Contracts [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Units Of Gasoline | gal | 15 |
Purchase [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | $ 2,600 |
Sold [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Notional Amount | 5,600 |
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 | 7 | (3)
Interest Expense [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (28) | 4
Operating Expense [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 1 | $ (5)

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