Adoption of ASU 2018-12 - Summary of Changes in Reinsurance Recoverables (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses	$ 29,843	$ 19,953	$ 19,388
Protective
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses	9,100	9,600
Swiss Re
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses	$ 1,600	1,600
Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			790
Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			2
Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			906
Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			162
UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			332
Other Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			17,196
Accounting Standards Update 2018-12 | Cumulative Effect to Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			3,038
Accounting Standards Update 2018-12 | Cumulative Effect to Retained Earnings | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			0
Accounting Standards Update 2018-12 | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			607
Accounting Standards Update 2018-12 | Payout Annuities | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			0
Accounting Standards Update 2018-12 | Traditional Life | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			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]
Reinsurance recoverables, net of allowance for credit losses			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]
Reinsurance recoverables, net of allowance for credit losses			(3)
Accounting Standards Update 2018-12 | Other Operations | Protective
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			13,200
Accounting Standards Update 2018-12 | Other Operations | Swiss Re
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			2,600
Accounting Standards Update 2018-12 | Other Operations | Cumulative Effect to Retained Earnings | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			610
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses		$ 20,392	16,350
As Previously Reported | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			790
As Previously Reported | Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			2
As Previously Reported | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			755
As Previously Reported | Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			148
As Previously Reported | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			335
As Previously Reported | Other Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			14,320
As Previously Reported | Accounting Standards Update 2018-12 | Other Operations | Protective
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			12,000
As Previously Reported | Accounting Standards Update 2018-12 | Other Operations | Swiss Re
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			1,300
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			2,431
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			0
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Payout Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			0
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			151
Single-A Discount Rate Measurement in AOCI | Accounting Standards Update 2018-12 | Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance recoverables, net of allowance for credit losses			14
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]
Reinsurance recoverables, net of allowance for credit losses			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]
Reinsurance recoverables, net of allowance for credit losses			$ 2,266