Accounting Changes and Error Corrections (Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2023		Mar. 31, 2023	Dec. 31, 2022		Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities, available-for-sale	$ 56,236	[1]		$ 52,901	[2]
Available-for-sale Securities, Equity Securities	136			134
Mortgage loans (net of allowance for credit losses of $57 and $51)	7,038			6,590
Policy loans	1,202			1,231
Funds withheld at interest	5,862			6,003
Real Estate Investments, Joint Ventures	2,473			2,327
Short-term investments	224			154
Other invested assets	1,119			1,140
Investments	74,290			70,480
Cash and cash equivalents	2,598			2,927
Accrued investment income	702			630
Premiums receivable and other reinsurance balances	3,321			3,013
Reinsurance Recoverables, Including Reinsurance Premium Paid	2,664			2,671
Deferred policy acquisition costs	4,286			4,128		$ 3,935
Other assets	1,179			1,055
Assets	89,040			84,904
Future policy benefits	38,239			35,689		37,028
Interest-sensitive contract liabilities	29,910			30,342
Market Risk Benefit, Net Amount at Risk	235			247
Other policy claims and benefits	2,579			2,480
Other reinsurance balances	858			725
Deferred income taxes	1,424			1,383
Other liabilities	3,050			2,906
Long-term debt	4,850			3,961
Liabilities	81,145			77,733
Preferred stock – par value $0.01 per share, 10,000,000 shares authorized, no shares issued or outstanding	0			0
Common stock – par value $0.01 per share, 140,000,000 shares authorized, 85,310,598 shares issued at June 30, 2023 and December 31, 2022	1			1
Additional paid-in-capital	2,522			2,502
Retained earnings	8,483			8,169
Treasury Stock, Value	(1,803)			(1,720)
Accumulated other comprehensive income (loss)	(1,398)			(1,871)		(1,484)		$ (500)
Stockholders' Equity Attributable to Parent	7,805		$ 7,626	7,081		7,389	$ 7,947	8,180
Stockholders' Equity Attributable to Noncontrolling Interest	90		90	90		90	90	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,895		$ 7,716	7,171		$ 7,479	$ 8,037	8,180
Liabilities and Equity	$ 89,040			84,904
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities, available-for-sale				52,901				60,749
Available-for-sale Securities, Equity Securities				134				151
Mortgage loans (net of allowance for credit losses of $57 and $51)				6,590				6,283
Policy loans				1,231				1,234
Funds withheld at interest				6,003				6,954
Real Estate Investments, Joint Ventures				2,327				1,996
Short-term investments				154				87
Other invested assets				1,140				1,074
Investments				70,480				78,528
Cash and cash equivalents				2,927				2,948
Accrued investment income				630				533
Premiums receivable and other reinsurance balances				3,013				2,888
Reinsurance Recoverables, Including Reinsurance Premium Paid				2,671				3,165
Deferred policy acquisition costs				4,128				3,860
Other assets				1,055				1,019
Assets				84,904				92,941
Future policy benefits				35,689				47,449
Interest-sensitive contract liabilities				30,342				26,119
Market Risk Benefit, Net Amount at Risk				247				262
Other policy claims and benefits				2,480				2,110
Other reinsurance balances				725				557
Deferred income taxes				1,383				1,499
Other liabilities				2,906				2,918
Long-term debt				3,961				3,667
Collateralized Financings								180
Liabilities				77,733				84,761
Preferred stock – par value $0.01 per share, 10,000,000 shares authorized, no shares issued or outstanding				0				0
Common stock – par value $0.01 per share, 140,000,000 shares authorized, 85,310,598 shares issued at June 30, 2023 and December 31, 2022				1				1
Additional paid-in-capital				2,502				2,461
Retained earnings				8,169				7,871
Treasury Stock, Value				(1,720)				(1,653)
Accumulated other comprehensive income (loss)				(1,871)				(500)
Stockholders' Equity Attributable to Parent				7,081				8,180	$ 6,839
Stockholders' Equity Attributable to Noncontrolling Interest				90				0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				7,171				8,180	6,839
Liabilities and Equity				84,904				92,941
Accounting Standards Update 2018-12 | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities, available-for-sale				52,901				60,749
Available-for-sale Securities, Equity Securities				134				151
Mortgage loans (net of allowance for credit losses of $57 and $51)				6,590				6,283
Policy loans				1,231				1,234
Funds withheld at interest				6,003				6,954
Real Estate Investments, Joint Ventures				2,327				1,996
Short-term investments				154				87
Other invested assets				1,140				1,074
Investments				70,480				78,528
Cash and cash equivalents				2,927				2,948
Accrued investment income				630				533
Premiums receivable and other reinsurance balances				3,013				2,888
Reinsurance Recoverables, Including Reinsurance Premium Paid				2,462				2,580
Deferred policy acquisition costs				3,974				3,690
Other assets				1,220				1,008
Assets				84,706				92,175
Future policy benefits				35,220				35,782
Interest-sensitive contract liabilities				30,572				26,377
Market Risk Benefit, Net Amount at Risk				0				0
Other policy claims and benefits				6,571				6,993
Other reinsurance balances				756				613
Deferred income taxes				736				2,886
Other liabilities				2,655				2,663
Long-term debt				3,961				3,667
Collateralized Financings								180
Liabilities				80,471				79,161
Preferred stock – par value $0.01 per share, 10,000,000 shares authorized, no shares issued or outstanding				0				0
Common stock – par value $0.01 per share, 140,000,000 shares authorized, 85,310,598 shares issued at June 30, 2023 and December 31, 2022				1				1
Additional paid-in-capital				2,502				2,461
Retained earnings				8,967				8,563
Treasury Stock, Value				(1,720)				(1,653)
Accumulated other comprehensive income (loss)				(5,605)				3,642
Stockholders' Equity Attributable to Parent				4,145				13,014	14,352
Stockholders' Equity Attributable to Noncontrolling Interest				90				0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				4,235				13,014	$ 14,352
Liabilities and Equity				84,706				92,175
Accounting Standards Update 2018-12 | Revision of Prior Period, Change in Accounting Principle, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities, available-for-sale				0				0
Available-for-sale Securities, Equity Securities				0				0
Mortgage loans (net of allowance for credit losses of $57 and $51)				0				0
Policy loans				0				0
Funds withheld at interest				0				0
Real Estate Investments, Joint Ventures				0				0
Short-term investments				0				0
Other invested assets				0				0
Investments				0				0
Cash and cash equivalents				0				0
Accrued investment income				0				0
Premiums receivable and other reinsurance balances				0				0
Reinsurance Recoverables, Including Reinsurance Premium Paid				209				585
Deferred policy acquisition costs				154				170
Other assets				(165)				11
Assets				198				766
Future policy benefits				469				11,667
Interest-sensitive contract liabilities				(230)				(258)
Market Risk Benefit, Net Amount at Risk				247				262
Other policy claims and benefits				(4,091)				(4,883)
Other reinsurance balances				(31)				(56)
Deferred income taxes				647				(1,387)
Other liabilities				251				255
Long-term debt				0				0
Collateralized Financings								0
Liabilities				(2,738)				5,600
Preferred stock – par value $0.01 per share, 10,000,000 shares authorized, no shares issued or outstanding				0				0
Common stock – par value $0.01 per share, 140,000,000 shares authorized, 85,310,598 shares issued at June 30, 2023 and December 31, 2022				0				0
Additional paid-in-capital				0				0
Retained earnings				(798)				(692)
Treasury Stock, Value				0				0
Accumulated other comprehensive income (loss)				3,734				(4,142)
Stockholders' Equity Attributable to Parent				2,936				(4,834)
Stockholders' Equity Attributable to Noncontrolling Interest				0				0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				2,936				(4,834)
Liabilities and Equity				$ 198				$ 766

[1] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of June 30, 2023, the fair value of such investments was $768 million.

[2] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million