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)	(3)
Stock-based compensation	6	0	0	0	0	6	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(6)	(2)	0	0	0	0	(4)	0
Ending balance at Jun. 30, 2021	1,123	732	87	0	0	249	(5)	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(3)	(12)	8	0	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8
Noncontrolling Interest, Change in Redemption Value	(14)	(14)
Beginning 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)	(2)	(29)	27	0	0	0	0	0
Stock-based compensation	2	0	0	0	0	2	0	0
Ending balance at Jun. 30, 2021	1,123	732	87	0	0	249	(5)	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	27
Noncontrolling Interest, Change in Redemption Value	(1)	(1)
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)	(247)
Stock-based compensation	10	0	0	0	0	10	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(3)	(5)	0	0	0	0	1	0
Treasury Stock, Value, Acquired, Cost Method	(14)						(14)
Ending balance at Jun. 30, 2022	846	728	(196)	0	0	267	(16)	62
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(246)	7	(254)	0	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(254)
Noncontrolling Interest, Change in Redemption Value	0
Proceeds from Noncontrolling Interests	2					0		2
Beginning balance at Mar. 31, 2022	974	723	(70)	0	0	262	(2)	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(121)
Stock-based compensation	5	0	0	0	0	5	0	0
Treasury Stock, Value, Acquired, Cost Method	(14)						(14)
Ending balance at Jun. 30, 2022	846	728	(196)	0	0	267	(16)	62
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(121)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(126)	$ 5	$ (126)	$ 0	$ 0	0	$ 0	0
Noncontrolling Interest, Change in Redemption Value	0
Proceeds from Noncontrolling Interests	2					$ 0		$ 2
Public Finance Puerto Rico Net Par Outstanding	$ 467