Units Of Gasoline

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+ References

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Financial Instruments (Narrative) (Detail) gal in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) gal	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) gal	Jun. 30, 2019 USD ($)
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 17		$ 17
Derivative Instruments, Gain (Loss) Recognized in Income, Net	28	$ 13	10	$ 1
Interest Rate Caps [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative, Notional Amount	8,345		8,345
Interest Rate Caps [Member] \| Subsidiaries [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative, Notional Amount	3,000		3,000
Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative, Notional Amount	2,250		2,250
Currency Swap [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative, Notional Amount	$ 1,563		$ 1,563
Commodity Contracts [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Units Of Gasoline \| gal	10		10
Purchase [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative, Notional Amount	$ 2,700		$ 2,700
Sold [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative, Notional Amount	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	(2)	(1)	$ 7	$ (4)
Interest Expense [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative Instruments, Gain (Loss) Recognized in Income, Net		15
Operating Expense [Member]
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 8	$ (5)