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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) gal | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) gal | Jun. 30, 2016 USD ($)
Schedule of Cost-method Investments [Line Items] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2017 |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 2 |  | $ 2 |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (50) | $ 25 | (67) | $ (4)
Interest Rate Caps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 10,855 |  | 10,855 |
Interest Rate Caps [Member] | Subsidiaries [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 5,100 |  | 5,100 |
Interest Rate Swaps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 1,800 |  | 1,800 |
Currency Swap [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 1,176 |  | $ 1,176 |
Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Units Of Gasoline | gal | 6 |  | 6 |
Purchase [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | $ 2,900 |  | $ 2,900 |
Sold [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Absolute notional values of derivative instruments | 8,000 |  | 8,000 |
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (1) | 2 | (2) | 0
Interest Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 11 | 26 | 18 | 35
Operating Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 10 | $ 4 | $ 15 | $ 23

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