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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) gal | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) gal | Jun. 30, 2015 USD ($)
Schedule of Cost-method Investments [Line Items] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2016 |
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 | 25 | $ (26) | (4) | $ 43
Interest Rate Caps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 9,608 |  | 9,608 |
Interest Rate Caps [Member] | Interest Rate Caps Purchased [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 2,300 |  | 2,300 |
Interest Rate Caps [Member] | Interest Rate Caps Purchased [Member] | Subsidiary Issuers [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 5,000 |  | 5,000 |
Interest Rate Caps [Member] | Interest Rate Caps Sold [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 7,300 |  | 7,300 |
Interest Rate Swaps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 2,400 |  | $ 2,400 |
Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Units Of Gasoline | gal | 10 |  | 10 |
Currency Swap [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 993 |  | $ 993 |
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 2 | 4 | 0 | 4
Interest Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 26 | $ 19 | 35 | 2
Operating Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 4 |  | $ 23 | $ 14

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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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