Impact of New Accounting Standard (Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37)	$ 60,467	[1]	$ 52,901	[2]
Equity Securities, FV-NI	139		134
Mortgage loans (net of allowance for credit losses of $67 and $51)	7,377		6,590
Policy loans	1,206		1,231
Funds withheld at interest	5,683		6,003
Real Estate Investments, Joint Ventures	2,635		2,327
Short-term investments	222		154
Other invested assets	1,171		1,140
Investments	78,900		70,480
Cash and cash equivalents	2,970		2,927		$ 2,948		$ 3,408
Accrued investment income	759		630
Premiums receivable and other reinsurance balances	3,528		3,013
Reinsurance ceded receivables and other	5,448		2,671
Deferred policy acquisition costs	4,617		4,128
Other assets	1,401		1,055
Total assets	97,623		84,904		92,941
Future policy benefits	41,231		35,689
Interest-sensitive contract liabilities	30,273		30,342
Market Risk Benefit, Net Amount at Risk	258		247
Other policy claims and benefits	2,730		2,480
Other reinsurance balances	1,103		725
Deferred income taxes	1,862		1,383
Other liabilities	2,085		1,420
Long-term debt	4,427		3,961
Liabilities	88,452		77,733
Preferred stock (par value $.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; shares issued: 85,310,598 at both December 31, 2023 and December 31, 2022)	1		1
Additional paid-in-capital	2,544		2,502
Retained earnings	8,805		8,169
Treasury Stock, Value	(1,900)		(1,720)
Accumulated other comprehensive income (loss)	(369)		(1,871)		(500)	$ (909)
Total stockholders equity	9,081		7,081
Stockholders' Equity Attributable to Noncontrolling Interest	90		90
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	9,171		7,171
Total liabilities and stockholders’ equity	97,623		84,904
Funds Held under Reinsurance Agreements, Liability	$ 4,483		1,486
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37)			52,901		60,749
Equity Securities, FV-NI			134		151
Mortgage loans (net of allowance for credit losses of $67 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 ceded receivables and other			2,671		3,165
Deferred policy acquisition costs			4,128		3,860
Other assets			1,055		1,019
Total 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			1,420		1,066
Long-term debt			3,961		3,667
Liabilities			77,733		84,761
Preferred stock (par value $.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; shares issued: 85,310,598 at both December 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)
Total stockholders equity			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
Total liabilities and stockholders’ equity			84,904		92,941
Collateralized Financings					180
Funds Held under Reinsurance Agreements, Liability			1,486		1,852
Previously Reported | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37)			52,901		60,749
Equity Securities, FV-NI			134		151
Mortgage loans (net of allowance for credit losses of $67 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 ceded receivables and other			2,462		2,580
Deferred policy acquisition costs			3,974		3,690
Other assets			1,220		1,008
Total 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			1,169		811
Long-term debt			3,961		3,667
Liabilities			80,471		79,161
Preferred stock (par value $.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; shares issued: 85,310,598 at both December 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
Total stockholders equity			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
Total liabilities and stockholders’ equity			84,706		92,175
Collateralized Financings					180
Funds Held under Reinsurance Agreements, Liability			1,486		1,852
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37)			0		0
Equity Securities, FV-NI			0		0
Mortgage loans (net of allowance for credit losses of $67 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 ceded receivables and other			209		585
Deferred policy acquisition costs			154		170
Other assets			(165)		11
Total 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
Liabilities			(2,738)		5,600
Preferred stock (par value $.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; shares issued: 85,310,598 at both December 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)
Total stockholders equity			2,936		(4,834)
Stockholders' Equity Attributable to Noncontrolling Interest			0		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			2,936		(4,834)
Total liabilities and stockholders’ equity			198		766
Collateralized Financings					0
Funds Held under Reinsurance Agreements, Liability			$ 0		$ 0

[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 December 31, 2023, the fair value of such investments was $856 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.