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, 2020	$ 3,577		$ 55	$ 433	$ 4,668	$ 364		$ (1,943)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	181					181
Other comprehensive (loss) income (I)	32							32
Cash dividends declared:
Preferred dividends declared, value		$ (2)					$ (2)
Common share, value	(9)					(9)
Repurchase and retirement of common stock	(225)			(7)	(218)
Stock-based compensation	28				28
Common stock issued: compensation plans	(3)			2	(5)
Ending balance at Sep. 30, 2021	3,579		55	428	4,473	534		(1,911)
Beginning balance at Jun. 30, 2021	3,598		55	429	4,481	517		(1,884)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27					27
Other comprehensive (loss) income (I)	(27)							(27)
Cash dividends declared:
Preferred dividends declared, value		(1)					(1)
Common share, value	(9)					(9)
Repurchase and retirement of common stock	(25)			(1)	(24)
Stock-based compensation	14				14
Common stock issued: compensation plans	2				2
Ending balance at Sep. 30, 2021	3,579		55	428	4,473	534		(1,911)
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) income (I)	(248)							(248)
Cash dividends declared:
Preferred dividends declared, value		(2)					(2)
Common share, value	(42)					(42)
Repurchase and retirement of common stock	(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) income (I)	(119)							(119)
Cash dividends declared:
Preferred dividends declared, value		$ (1)					$ (1)
Common share, value	(25)					(25)
Repurchase and retirement of common stock	(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)