Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions		Total		Prior to Adoption	Effect of Adoption	Common Stock		Additional Paid-in Capital		Retained Earnings		Retained Earnings Prior to Adoption	Retained Earnings Effect of Adoption	Accumulated Other Comprehensive (Loss)		Accumulated Other Comprehensive (Loss) Prior to Adoption	Accumulated Other Comprehensive (Loss) Effect of Adoption	Treasury Stock
Total stockholder's equity at beginning of period at Dec. 31, 2020	[1]					$ 683		$ 2,211		$ 9,075		$ 9,081	$ (6)	$ (1,537)		$ 803	$ (2,340)	$ (71)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	[1]							4										17
Dividends to common stockholders ($2.88, $3.60, and $2.27 per share)	[1]									(620)
Net income		$ 1,184	[1]	$ 1,202	$ (18)					1,184	[1]
Other comprehensive income (loss)		177	[1]	(483)	660									177	[1]
Purchase of treasury stock	[1]																	(18)
Total stockholder's equity at end of period at Dec. 31, 2021	[1]	11,105				683		2,215		9,639		9,663	(24)	(1,360)		320	(1,680)	(72)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	[1]							5										18
Dividends to common stockholders ($2.88, $3.60, and $2.27 per share)	[1]									(985)
Net income		682	[1]	894	(212)					682	[1]
Other comprehensive income (loss)		(2,238)	[1]	(3,877)	1,639									(2,238)	[1]
Purchase of treasury stock	[1]																	(39)
Total stockholder's equity at end of period at Dec. 31, 2022		8,548	[1]	$ 8,825	$ (277)	683	[1]	2,220	[1]	9,336	[1]	$ 9,572	$ (236)	(3,598)	[1]	$ (3,557)	$ (41)	(93)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation								1										23
Dividends to common stockholders ($2.88, $3.60, and $2.27 per share)										(786)
Net income		1,205								1,205
Other comprehensive income (loss)		926												926
Purchase of treasury stock																		(24)
Total stockholder's equity at end of period at Dec. 31, 2023		$ 9,893				$ 683		$ 2,221		$ 9,755				$ (2,672)				$ (94)

[1] As of January 1, 2023, the Company adopted ASU 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts (ASU 2018-12) using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Consolidated Financial Statements for additional information.