CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Preferred stock	Total common equity	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Balance at beginning of period at Dec. 31, 2023		$ 265		$ 0	$ 12,740	$ 560	$ (1,926)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans					(6)
Net income	$ 482					482
Cash dividends declared on preferred stock						(8)
Cash dividends declared on common stock						0
Other comprehensive income, net of tax	279						279
Balance at end of period at Sep. 30, 2024	12,386	265	$ 12,121	0	12,734	1,034	(1,647)
Balance at beginning of period at Jun. 30, 2024		265		0	12,736	946	(2,093)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans					(2)
Net income	88					88
Cash dividends declared on common stock						0
Other comprehensive income, net of tax	446						446
Balance at end of period at Sep. 30, 2024	12,386	265	12,121	0	12,734	1,034	(1,647)
Balance at beginning of period at Dec. 31, 2024	12,489	265		0	12,727	1,269	(1,772)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans					(21)
Net income	827					827
Cash dividends declared on preferred stock						(8)
Cash dividends declared on common stock						(1,500)
Other comprehensive income, net of tax	204						204
Balance at end of period at Sep. 30, 2025	11,991	265	11,726	0	12,706	588	(1,568)
Balance at beginning of period at Jun. 30, 2025		265		0	12,718	710	(1,683)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee benefit plans					(12)
Net income	378					378
Cash dividends declared on common stock						(500)
Other comprehensive income, net of tax	115						115
Balance at end of period at Sep. 30, 2025	$ 11,991	$ 265	$ 11,726	$ 0	$ 12,706	$ 588	$ (1,568)