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) Income		Accumulated Other Comprehensive (Loss) Income Prior to Adoption	Accumulated Other Comprehensive (Loss) Income Effect of Adoption	Treasury Stock
Total stockholder's equity at beginning of period at Dec. 31, 2021	[1]					$ 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]						(12)									17
Dividends to common stockholders ($0.42, $0.40, $2.04, $2.80 per share)	[1]							(766)
Net income		$ 485	[2]	$ 518	$ (33)			485	[1]
Other comprehensive income (loss)		(1,803)		(3,033)	1,230							(1,803)	[1]
Purchase of treasury stock		(21)														(21)	[1]
Total stockholder's equity at end of period at Jun. 30, 2022	[1]	$ 9,005				683	2,203	9,358				(3,163)				(76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (usd per share)		$ 2.80
Total stockholder's equity at beginning of period at Mar. 31, 2022	[1]					683	2,195	9,277		9,319	(42)	(2,380)		(1,303)	(1,077)	(77)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	[1]						8									1
Dividends to common stockholders ($0.42, $0.40, $2.04, $2.80 per share)	[1]							(109)
Net income		$ 190	[3],[4]	205	(15)			190	[1]
Other comprehensive income (loss)		(783)	[4]	(1,410)	627							(783)	[1]
Purchase of treasury stock	[1]															0
Total stockholder's equity at end of period at Jun. 30, 2022	[1]	$ 9,005				683	2,203	9,358				(3,163)				(76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (usd per share)		$ 0.40
Total stockholder's equity at beginning of period at Dec. 31, 2022		$ 8,548	[5]	$ 8,825	$ (277)	683	2,220	9,336		9,572	(236)	(3,598)		(3,557)	(41)	(93)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation							(16)									22
Dividends to common stockholders ($0.42, $0.40, $2.04, $2.80 per share)								(557)
Net income		580						580
Other comprehensive income (loss)		173										173
Purchase of treasury stock		(24)														(24)
Total stockholder's equity at end of period at Jun. 30, 2023		$ 8,726				683	2,204	9,359				(3,425)				(95)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (usd per share)		$ 2.04
Total stockholder's equity at beginning of period at Mar. 31, 2023						683	2,196	9,191		$ 9,191	$ 0	(3,308)		$ (3,308)	$ 0	(95)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation							8									0
Dividends to common stockholders ($0.42, $0.40, $2.04, $2.80 per share)								(115)
Net income		$ 283						283
Other comprehensive income (loss)		(117)										(117)
Purchase of treasury stock																0
Total stockholder's equity at end of period at Jun. 30, 2023		$ 8,726				$ 683	$ 2,204	$ 9,359				$ (3,425)				$ (95)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (usd per share)		$ 0.42

[1] As of January 1, 2023, the Company adopted 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 Condensed Consolidated Financial Statements for additional information.

[2] As of January 1, 2023, the Company adopted 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 Condensed Consolidated Financial Statements for additional information.

[3] 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 Condensed Consolidated Financial Statements for additional information.

[4] As of January 1, 2023, the Company adopted 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 Condensed Consolidated Financial Statements for additional information.

[5] As of January 1, 2023, the Company adopted 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 Condensed Consolidated Financial Statements for additional information.