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	$ 39,864	$ 38,826	$ 42,828
Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			2,668
Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			4,426
Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			5,939
UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			12,308
Other Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			13,922
Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,565
Accounting Standards Update 2018-12 | Cumulative Effect to Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,932
Accounting Standards Update 2018-12 | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			844
Accounting Standards Update 2018-12 | Payout Annuities | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			44
Accounting Standards Update 2018-12 | Traditional Life | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Accounting Standards Update 2018-12 | Group Protection | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Accounting Standards Update 2018-12 | UL and Other | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			174
Accounting Standards Update 2018-12 | Other Operations | Protective
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			7,400
Accounting Standards Update 2018-12 | Other Operations | Swiss Re
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,500
Accounting Standards Update 2018-12 | Other Operations | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			626
Accounting Standards Update 2018-12 | Other | Cumulative Effect to Retained Earnings | 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		41,756	38,896
As Previously Reported | Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			2,314
As Previously Reported | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,483
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			13,649
As Previously Reported | Other Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			10,463
As Previously Reported | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			3,565
As Previously Reported | Accounting Standards Update 2018-12 | Other Operations | Protective
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			6,300
As Previously Reported | Accounting Standards Update 2018-12 | Other Operations | Swiss Re
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			2,000
Adoption of New Accounting Standard | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits		$ (2,930)	(1,700)
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			(105)
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			(1,515)
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | Other Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			(80)
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			4,788
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			415
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			943
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			517
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			0
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Other Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			2,913
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future contract benefits			$ 0