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
Beginning balance at Dec. 31, 2023	$ 4,037		$ 55	$ 410	$ 3,682	$ 1,720		$ (1,830)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	243					243
Other comprehensive income (loss)	(31)							(31)
Cash dividends declared:
Preferred		$ (1)					$ (1)
Common	(20)					(20)
Repurchase and retirement of common stock (H)	(150)			(2)	(148)
Stock-based compensation	15				15
Common stock issued: compensation plans	(7)				(7)
Ending balance at Mar. 31, 2024	4,086		55	408	3,542	1,942		(1,861)
Beginning balance 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 (H)	(126)			(1)	(125)
Stock-based compensation	14				14
Ending balance at Mar. 31, 2025	$ 4,792		$ 55	$ 404	$ 3,095	$ 3,068		$ (1,830)