Accounting Changes and Error Corrections (Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2023		Dec. 31, 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	$ 56,085	[1]	$ 52,901	[2]
Available-for-sale Securities, Equity Securities	138		134
Mortgage loans (net of allowance for credit losses of $48 and $51)	6,833		6,590
Policy loans	1,221		1,231
Funds withheld at interest	5,976		6,003
Real Estate Investments, Joint Ventures	2,405		2,327
Short-term investments	246		154
Other invested assets	1,111		1,140
Investments	74,015		70,480
Cash and cash equivalents	3,294		2,927
Accrued investment income	672		630
Premiums receivable and other reinsurance balances	3,114		3,013
Reinsurance Recoverables, Including Reinsurance Premium Paid	2,723		2,671
Deferred policy acquisition costs	4,257		4,128		$ 3,906
Other assets	1,045		1,055
Assets	89,120		84,904
Future policy benefits	38,222		35,689		42,406
Interest-sensitive contract liabilities	30,405		30,342
Market Risk Benefit, Net Amount at Risk	261		247
Other policy claims and benefits	2,558		2,480
Other reinsurance balances	851		725
Deferred income taxes	1,446		1,383
Other liabilities	3,206		2,906
Long-term debt	4,455		3,961
Liabilities	81,404		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 March 31, 2023 and December 31, 2022	1		1
Additional paid-in-capital	2,506		2,502
Retained earnings	8,336		8,169
Treasury Stock, Value	(1,756)		(1,720)
Accumulated other comprehensive income (loss)	(1,461)		(1,871)		(858)	$ (500)
Stockholders' Equity Attributable to Parent	7,626		7,081		7,947	8,180
Stockholders' Equity Attributable to Noncontrolling Interest	90		90		90	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,716		7,171		$ 8,037	8,180
Liabilities and Equity	$ 89,120		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 $48 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 March 31, 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 $48 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 March 31, 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 $48 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 March 31, 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 March 31, 2023, the fair value of such investments was $726 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