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	80					80
Other comprehensive income	2							2
Cash dividends declared:
Preferred dividends declared, value		$ (1)					$ (1)
Stock-based compensation	6				6
Common stock issued: compensation plans	(2)			1	(3)
Ending balance at Mar. 31, 2021	3,662		55	434	4,671	443		(1,941)
Beginning balance at Dec. 31, 2021	3,508		55	422	4,291	603		(1,863)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	131					131
Other comprehensive income	(1)							(1)
Cash dividends declared:
Preferred dividends declared, value		$ (1)					$ (1)
Common share, value	(8)					(8)
Repurchase and retirement of common stock	(175)			(5)	(170)
Stock-based compensation	11				11
Common stock issued: compensation plans	(8)			1	(9)
Ending balance at Mar. 31, 2022	$ 3,457		$ 55	$ 418	$ 4,123	$ 725		$ (1,864)