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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at Beginning of Year	$ 14,791	$ 15,184	$ 15,362
Net Income (Loss)	161	(123)
Reclassification Adjustments	31	20
Balance at End of Year	13,641	14,791	15,184
Pensions and other postretirement liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at Beginning of Year	(526)	(421)
Net Income (Loss)	139	(125)
Reclassification Adjustments	31	20
Balance at End of Year	(356)	(526)	(421)
Other comprehensive income of equity investees
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at Beginning of Year	(68)	(70)
Net Income (Loss)	22	2
Reclassification Adjustments	0	0
Balance at End of Year	(46)	(68)	(70)
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at Beginning of Year	(594)	(491)	(563)
Balance at End of Year	$ (402)	$ (594)	$ (491)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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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