Consolidated Statements of Changes in Equity (Deficit) (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Changes in net unrealized gains on available-for-sale securities, net of tax	$ 0	$ 21,000,000	$ 28,000,000
Reclassification adjustment for gains included in net loss, net of tax	48,000,000	70,000,000	139,000,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Tax Effect	$ 3	$ 0	$ 0