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	154					154
Other comprehensive income (loss)	59							59
Cash dividends declared:
Preferred dividends declared, value		$ (1)					$ (1)
Repurchase and retirement of common stock	(200)			(6)	(194)
Stock-based compensation	14				14
Common stock issued: compensation plans	(5)			2	(7)
Ending balance at Jun. 30, 2021	3,598		55	429	4,481	517		(1,884)
Beginning balance at Mar. 31, 2021	3,662		55	434	4,671	443		(1,941)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	74					74
Other comprehensive income (loss)	57							57
Cash dividends declared:
Repurchase and retirement of common stock	(200)			(6)	(194)
Stock-based compensation	8				8
Common stock issued: compensation plans	(3)			1	(4)
Ending balance at Jun. 30, 2021	3,598		55	429	4,481	517		(1,884)
Beginning balance at Dec. 31, 2021	3,508		55	422	4,291	603		(1,863)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	278					278
Other comprehensive income (loss)	(129)							(129)
Cash dividends declared:
Preferred dividends declared, value		$ (1)					$ (1)
Common share, value	(17)					(17)
Repurchase and retirement of common stock	(235)			(7)	(228)
Stock-based compensation	29				29
Common stock issued: compensation plans	(12)			1	(13)
Ending balance at Jun. 30, 2022	3,421		55	416	4,079	863		(1,992)
Beginning balance at Mar. 31, 2022	3,457		55	418	4,123	725		(1,864)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	147					147
Other comprehensive income (loss)	(128)							(128)
Cash dividends declared:
Common share, value	(9)					(9)
Repurchase and retirement of common stock	(60)			(2)	(58)
Stock-based compensation	18				18
Common stock issued: compensation plans	(4)				(4)
Ending balance at Jun. 30, 2022	$ 3,421		$ 55	$ 416	$ 4,079	$ 863		$ (1,992)