Consolidated Statements Of Stockholders' Equity - USD ($) $ in Millions	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Other comprehensive income (loss), net of tax				$ 9,984
Balance at Dec. 31, 2021		$ 4,735	$ 5,196	9,984
Stock compensation/issued for benefit plans		6
Net income (loss)			1,482		$ 1,482
Retirement of common stock/cancellation of shares		(155)	(245)
Common stock dividends declared			(79)
Other comprehensive income (loss), net of tax				(6,669)	(6,669)
Balance at Mar. 31, 2022		4,586	6,354	3,315	14,255
Balance at Dec. 31, 2022	$ 986	4,544	5,924	(6,352)	5,102
Stock compensation/issued for benefit plans		16
Net income (loss)			(881)		(881)
Preferred stock dividends declared			(25)
Common stock dividends declared			(78)
Other comprehensive income (loss), net of tax				2,598	2,598
Balance at Mar. 31, 2023	$ 986	$ 4,560	$ 4,940	$ (3,754)	$ 6,732