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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) gal | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) gal | Sep. 30, 2014 USD ($)
Schedule of Cost-method Investments [Line Items] |  |  |  |
Net unrealized gain (loss) on cash flow hedges | $ 1 | $ 29 | $ 25 | $ 31
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 | 15 | 23 | 32 | (7)
Interest Rate Caps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 8,428 |  | 8,428 |
Interest Rate Caps [Member] | Interest Rate Caps Purchased [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 2,100 |  | 2,100 |
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 | 4,200 |  | 4,200 |
Interest Rate Caps [Member] | Interest Rate Caps Sold [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 6,300 |  | 6,300 |
Interest Rate Swaps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 1,669 |  | $ 1,669 |
Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Units Of Gasoline | gal | 6 |  | 6 |
Currency Swap [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 724 |  | $ 724 |
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (4) | (2) | 0 | (1)
Interest Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 19 | 19 | 21 | $ 7
Operating Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 2 | $ 3 | $ 16 |

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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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