Adoption of ASU 2018-12 - Summary of Changes in Future Contract Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits	$ 40,174	$ 38,302	$ 42,044
Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,726
Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			760
Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			2,667
Payout Annuities | Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			44
Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,912
Traditional Life | Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			(2)
Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			5,939
Group Protection | Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			12,264
UL and Other | Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			92
Other Operations (1)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			13,737
Other Operations (1) | Accounting Standards Update 2018-12 | Protective
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			7,400
Other Operations (1) | Accounting Standards Update 2018-12 | Swiss Re
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,300
Other Operations (1) | Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			626
Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,525
Other | Accounting Standards Update 2018-12 | Cumulative effect from adoption of new accounting standards | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits		41,203	38,318
As Previously Reported | Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			2,313
As Previously Reported | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,062
As Previously Reported | Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			5,422
As Previously Reported | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			13,687
As Previously Reported | Other Operations (1)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			10,309
As Previously Reported | Other Operations (1) | Accounting Standards Update 2018-12 | Protective
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			6,300
As Previously Reported | Other Operations (1) | Accounting Standards Update 2018-12 | Swiss Re
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			1,800
As Previously Reported | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,525
Adoption of New Accounting Standard | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits		$ (2,901)	(1,700)
Adoption of New Accounting Standard | Payout Annuities | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			(105)
Adoption of New Accounting Standard | Traditional Life | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Adoption of New Accounting Standard | Group Protection | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Adoption of New Accounting Standard | UL and Other | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			(1,515)
Adoption of New Accounting Standard | Other Operations (1) | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			(80)
Adoption of New Accounting Standard | Other | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Single Discount Rate Measurement In AOCI | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			4,666
Single Discount Rate Measurement In AOCI | Payout Annuities | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			415
Single Discount Rate Measurement In AOCI | Traditional Life | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			852
Single Discount Rate Measurement In AOCI | Group Protection | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			517
Single Discount Rate Measurement In AOCI | UL and Other | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Single Discount Rate Measurement In AOCI | Other Operations (1) | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			2,882
Single Discount Rate Measurement In AOCI | Other | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			$ 0