Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total		Common Stock	Additional Paid-in Capital		Retained Earnings	Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interests
Balance, beginning at Dec. 31, 2018	$ 16,580		$ 132	$ 8,176		$ 9,524	$ (1,324)		$ 72
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	179					184			(5)
Other comprehensive income (loss), net of tax	183						183
Compensation—restricted stock units	18			18		0
Other	5	[1]		0	[1]	5	0	[1]	0	[1]
Net change	385			18		189	183		(5)
Balance, ending at Mar. 31, 2019	16,965		132	8,194		9,713	(1,141)		67
Balance, beginning at Dec. 31, 2019	16,367		132	8,222		8,788	(862)		87
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(310)					(306)			(4)
Other comprehensive income (loss), net of tax	600						600
Compensation—restricted stock units	18			18		0
Other	4			(1)		4	0		1
Net change	165			17		(449)	600		(3)
Balance, ending at Mar. 31, 2020	16,532		$ 132	$ 8,239		8,339	$ (262)		$ 84
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (147)					$ (147)

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