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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ (458)	$ 396	$ 1,210	$ 775
OTHER COMPREHENSIVE INCOME (LOSS):
Pension and OPEB prior service costs	(18)	(19)	(55)	(55)
Amortized losses on derivative hedges	2	4	19	8
Change in unrealized gains on available-for-sale securities	0	(6)	(106)	8
Other comprehensive loss	(16)	(21)	(142)	(39)
Income tax benefits on other comprehensive loss	(4)	(9)	(61)	(16)
Other comprehensive loss, net of tax	(12)	(12)	(81)	(23)
COMPREHENSIVE INCOME (LOSS)	$ (470)	$ 384	$ 1,129	$ 752

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OTHER COMPREHENSIVE INCOME:.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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

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