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	341					341
Other comprehensive income (loss) (I)	33							33
Cash dividends declared:
Preferred stock-Class A		$ (1)					$ (1)
Common	(34)					(34)
Repurchase and retirement of common stock (H)	(125)			(3)	(122)
Stock-based compensation	26				26
Common stock issued: compensation plans	(66)			3	(69)
Ending balance at Jun. 30, 2023	3,775		55	412	3,782	1,334		(1,808)
Beginning balance at Mar. 31, 2023	3,761		55	412	3,941	1,159		(1,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	193					193
Other comprehensive income (loss) (I)	(2)							(2)
Cash dividends declared:
Common	(18)					(18)
Repurchase and retirement of common stock (H)	(100)			(3)	(97)
Stock-based compensation	12				12
Common stock issued: compensation plans	(71)			3	(74)
Ending balance at Jun. 30, 2023	3,775		55	412	3,782	1,334		(1,808)
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	509					509
Other comprehensive income (loss) (I)	(28)							(28)
Cash dividends declared:
Preferred stock-Class A		$ (1)					$ (1)
Common	(42)					(42)
Repurchase and retirement of common stock (H)	(211)			(3)	(208)
Stock-based compensation	38				38
Common stock issued: compensation plans	(25)			1	(26)
Ending balance at Jun. 30, 2024	4,277		55	408	3,486	2,186		(1,858)
Beginning balance at Mar. 31, 2024	4,086		55	408	3,542	1,942		(1,861)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	266					266
Other comprehensive income (loss) (I)	3							3
Cash dividends declared:
Common	(22)					(22)
Repurchase and retirement of common stock (H)	(61)			(1)	(60)
Stock-based compensation	23				23
Common stock issued: compensation plans	(18)			1	(19)
Ending balance at Jun. 30, 2024	$ 4,277		$ 55	$ 408	$ 3,486	$ 2,186		$ (1,858)