Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2020	$ 1,140	$ 759	$ 79	$ 0	$ 0	$ 242	$ (1)	$ 60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(2)	17	(18)	0	0	0	0	0
Stock-based compensation	4	0	0	0	0	4	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(6)	(2)	0	0	0	0	(4)	0
Ending balance at Mar. 31, 2021	1,123	761	61	0	0	246	(5)	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(18)
Noncontrolling Interest, Change in Redemption Value	(13)	(13)
Beginning balance at Dec. 31, 2021	1,098	726	58	0	0	257	(3)	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(125)
Stock-based compensation	5	0	0	0	0	5	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(3)	(5)	0	0	0	0	1	0
Ending balance at Mar. 31, 2022	974	723	(70)	0	0	262	(2)	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(125)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(127)	2	$ (127)	$ 0	$ 0	$ 0	$ 0	$ 0
Noncontrolling Interest, Change in Redemption Value	0	$ 0
Public Finance Puerto Rico Net Par Outstanding	$ 784