Statement of Changes in Consolidated Equity (unaudited) - USD ($) $ in Millions	Total	Preferred Class A	Preferred stock	Common stock	Additional capital	Retained earnings	Retained earnings Preferred Class A	Accumulated other comprehensive loss
Balance at beginning of period at Dec. 31, 2024	$ 4,554		$ 55	$ 405	$ 3,206	$ 2,766		$ (1,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	344					344
Other comprehensive income (loss)	48							48
Cash dividends declared:
Preferred		$ (1)					$ (1)
Common	(41)					(41)
Repurchase and retirement of common stock (I)	(126)			(1)	(125)
Stock-based compensation	14				14
Balance at end of period at Mar. 31, 2025	4,792		55	404	3,095	3,068		(1,830)
Balance at beginning of period at Dec. 31, 2025	5,353		0	402	2,531	4,093		(1,673)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	580					580
Other comprehensive income (loss)	(18)							(18)
Cash dividends declared:
Common	(48)					(48)
Repurchase and retirement of common stock (I)	(302)			(1)	(301)
Stock-based compensation	21				21
Common stock issued: compensation plans	(64)				(64)
Balance at end of period at Mar. 31, 2026	$ 5,522		$ 0	$ 401	$ 2,187	$ 4,625		$ (1,691)