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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) gal | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) gal | Sep. 30, 2017 USD ($)
Schedule of Cost-method Investments [Line Items] |  |  |  |
Document Period End Date |  |  | Sep. 30, 2018 |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 7 |  | $ 7 |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 6 | $ (23) | 46 | $ (90)
Interest Rate Caps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 8,482 |  | 8,482 |
Interest Rate Caps [Member] | Subsidiaries [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 3,000 |  | 3,000 |
Interest Rate Swaps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 1,500 |  | 1,500 |
Currency Swap [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 1,103 |  | $ 1,103 |
Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Units Of Gasoline | gal | 4 |  | 4 |
Purchase [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 2,700 |  | $ 2,700 |
Sold [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 5,700 |  | 5,700 |
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 0 | $ 1 | $ 1 | $ (1)

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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