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v3.19.1

Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) gal | Mar. 31, 2018 USD ($)
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Document Period End Date | Mar. 31, 2019 |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 5 |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 12 | $ (16)
Interest Rate Caps [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Absolute notional values of derivative instruments | 8,335 |
Interest Rate Caps [Member] | Subsidiaries [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Absolute notional values of derivative instruments | 3,000 |
Interest Rate Swaps [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Absolute notional values of derivative instruments | 1,500 |
Currency Swap [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Absolute notional values of derivative instruments | $ 1,839 |
Commodity Contracts [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Units Of Gasoline | gal | 14 |
Purchase [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Absolute notional values of derivative instruments | $ 2,700 |
Sold [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Absolute notional values of derivative instruments | 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 | 3 | 0
Interest Expense [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 4 | 13
Operating Expense [Member] |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 5 | $ 4

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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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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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