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, 2022	$ 3,601		$ 55	$ 412	$ 3,947	$ 1,028		$ (1,841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	148					148
Other comprehensive income (loss)	35							35
Cash dividends declared:
Preferred		$ (1)					$ (1)
Common	(16)					(16)
Repurchase and retirement of common stock (H)	(25)				(25)
Stock-based compensation	14				14
Common stock issued: compensation plans	5				5
Ending balance at Mar. 31, 2023	3,761		55	412	3,941	1,159		(1,806)
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)