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Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 8,659
Net change	(7)	$ 54
Ending Balance	8,449
Pension and Other Postretirement Liabilities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(854)	(363)
Changes in value	(26)	(43)
Amounts reclassified to earnings	13	5
Net change	(13)	(38)
Ending Balance	(867)	(401)
Derivative Contracts | Fuel
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2)	(215)
Changes in value		(16)
Amounts reclassified to earnings	2	138
Net change	2	122
Ending Balance		(93)
Investments and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2	3
Ending Balance	2	3
Pension and Other Postretirement Deferred Taxes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	24	(154)
Changes in value	10	16
Amounts reclassified to earnings	(5)	(2)
Net change	5	14
Ending Balance	29	(140)
Derivative Contracts Deferred Taxes | Fuel
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1	(102)
Changes in value		6
Amounts reclassified to earnings	(1)	(50)
Net change	(1)	(44)
Ending Balance		(146)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(829)	(831)
Changes in value	(16)	(37)
Amounts reclassified to earnings	9	91
Net change	(7)	54
Ending Balance	$ (836)	$ (777)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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-Topic 220
-SubTopic 10
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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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