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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) gal | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) gal | Jun. 30, 2019 USD ($)
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 17 |  | $ 17 |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 28 | $ 13 | 10 | $ 1
Interest Rate Caps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | 8,345 |  | 8,345 |
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 | 2,250 |  | 2,250 |
Currency Swap [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | $ 1,563 |  | $ 1,563 |
Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Units Of Gasoline | gal | 10 |  | 10 |
Purchase [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | $ 2,700 |  | $ 2,700 |
Sold [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative, Notional Amount | 5,700 |  | 5,700 |
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 | (2) | (1) | $ 7 | $ (4)
Interest Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net |  | 15 |  |
Operating Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 8 | $ (5) |  |

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