Statement of Changes in Consolidated Equity (unaudited) - USD ($) $ in Millions	Total	Class A	Preferred stock	Common stock	Additional capital	Retained earnings	Retained earnings Class A	Accumulated other comprehensive loss
Beginning balance at Dec. 31, 2021	$ 3,508		$ 55	$ 422	$ 4,291	$ 603		$ (1,863)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	358					358
Other comprehensive loss (I)	(248)							(248)
Cash dividends declared:
Preferred		$ (2)					$ (2)
Common	(42)					(42)
Repurchase and retirement of common stock (H)	(335)			(10)	(325)
Stock-based compensation	43				43
Common stock issued: compensation plans	(9)			2	(11)
Ending balance at Sep. 30, 2022	3,273		55	414	3,998	917		(2,111)
Beginning balance at Jun. 30, 2022	3,421		55	416	4,079	863		(1,992)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80					80
Other comprehensive loss (I)	(119)							(119)
Cash dividends declared:
Preferred		(1)					(1)
Common	(25)					(25)
Repurchase and retirement of common stock (H)	(100)			(3)	(97)
Stock-based compensation	14				14
Common stock issued: compensation plans	3			1	2
Ending balance at Sep. 30, 2022	3,273		55	414	3,998	917		(2,111)
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	529					529
Other comprehensive loss (I)	(9)							(9)
Cash dividends declared:
Preferred		(2)					(2)
Common	(70)					(70)
Repurchase and retirement of common stock (H)	(150)			(3)	(147)
Stock-based compensation	39				39
Common stock issued: compensation plans	(66)			3	(69)
Ending balance at Sep. 30, 2023	3,872		55	412	3,770	1,485		(1,850)
Beginning balance at Jun. 30, 2023	3,775		55	412	3,782	1,334		(1,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	188					188
Other comprehensive loss (I)	(42)							(42)
Cash dividends declared:
Preferred		$ (1)					$ (1)
Common	(36)					(36)
Repurchase and retirement of common stock (H)	(25)				(25)
Stock-based compensation	13				13
Ending balance at Sep. 30, 2023	$ 3,872		$ 55	$ 412	$ 3,770	$ 1,485		$ (1,850)