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v3.19.2

Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) gal | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) gal | Jun. 30, 2018 USD ($)
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 13 | $ (56) | $ 1 | $ (40)
Interest Rate Caps [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Absolute notional values of derivative instruments | 8,398 |  | 8,398 |
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 |  | 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 |  | 1,500 |
Currency Swap [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Absolute notional values of derivative instruments | $ 1,393 |  | $ 1,393 |
Commodity Contracts [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Units Of Gasoline | gal | 9 |  | 9 |
Purchase [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Absolute notional values of derivative instruments | $ 2,700 |  | $ 2,700 |
Sold [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
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] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (1) | (1) | (4) | (1)
Interest Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 15 | (20) | (11) | $ 7
Operating Expense [Member] |  |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ (5) | $ 8 | $ 12 |

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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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