Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Accounting Standards Update 2016-13 [Member]	Retained Earnings [Member]	Retained Earnings [Member] Accounting Standards Update 2016-13 [Member]	AOCI Attributable to Parent [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Common Stock Held in Treasury, at Cost [Member]	Noncontrolling Interest [Member]	Parent Company [Member]	Parent Company [Member] Retained Earnings [Member]	Parent Company [Member] AOCI Attributable to Parent [Member]	Parent Company [Member] Additional Paid-in Capital [Member]	Parent Company [Member] Common Stock Held in Treasury, at Cost [Member]
Beginning balance at Dec. 31, 2018	$ 1,633		$ 1,421		$ (49)	$ 0	$ 0	$ 219	$ 0	$ 41
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(125)		(216)		91	0	0	0	0	0	$ (125)	$ (216)	$ 91
Stock-based compensation	12		0		0	0	0	12	0	0	12			$ 12
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(3)		(3)		0	0	0	0	0	0	(3)	(3)			$ 0
AMPS Impact on Stockholders Equity	19									19
Ending balance at Dec. 31, 2019	1,536		1,203		42	0	0	232	0	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(400)		(437)		37	0	0	0	0	0	(400)	(437)	37
Stock-based compensation	11		0		0	0	0	11	0	0	11			11	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(3)		(2)		0	0	0	0	(1)	0	(3)	(2)			(1)
Ending balance at Dec. 31, 2020	1,140		759		79	0	0	242	(1)	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	7
Total comprehensive income (loss)	(38)		(17)		(21)	0	0	0	0	0	(38)	(17)	$ (21)
Effect of New Accounting Principle		$ (4)		$ (4)
Stock-based compensation	14		0		0	0	0	14	0	0	14			$ 14
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(6)		(4)		0	0	0	0	(2)	0	$ (6)	$ (4)			$ (2)
Ending balance at Dec. 31, 2021	1,098		726		$ 58	$ 0	$ 0	$ 257	$ (3)	$ 60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Change in Redemption Value	$ (12)		$ (12)