Business, Basis of Presentation and Summary of Significant Accounting Policies - Summary Matrix (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables	$ 18,530		$ 17,364				$ 18,169
Deferred policy acquisition costs and value of business acquired	19,850		19,653	$ 18,945			20,417
Other assets	10,977		11,025				11,742
Future policy benefits	190,474		187,222				224,358
Policyholder Account Balance	214,413		210,597				211,737
Other Policy-Related Balances	19,642		18,424				18,032
Market risk benefits	3,259		3,763				7,901
Deferred income tax liability	752		950				4,723
Retained earnings	39,928		40,332				31,824
Accumulated other comprehensive income (loss)	$ (20,386)	$ (19,147)	(22,621)	$ (18,106)	$ (10,044)	$ (2,451)	315
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables			17,461					$ 17,870
Deferred policy acquisition costs and value of business acquired			22,983					16,389
Other assets			11,026					11,685
Future policy benefits			204,228					206,656
Policyholder Account Balance			203,082					205,176
Other Policy-Related Balances			19,651					17,101
Market risk benefits			0					0
Deferred income tax liability			325					11,008
Retained earnings			41,953					36,491
Accumulated other comprehensive income (loss)			$ (27,083)					$ 18,072
Reclassification of carrying amount of contracts and contract features that are market risk benefits
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables							(59)
Deferred policy acquisition costs and value of business acquired							0
Other assets							0
Future policy benefits							(1,818)
Policyholder Account Balance							(958)
Other Policy-Related Balances							(72)
Market risk benefits							2,789
Deferred income tax liability							0
Retained earnings							0
Accumulated other comprehensive income (loss)							0
Adjustments for the difference between previous carrying amount and fair value measurement for market risk benefits
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables							(12)
Deferred policy acquisition costs and value of business acquired							0
Other assets							0
Future policy benefits							0
Policyholder Account Balance							0
Other Policy-Related Balances							0
Market risk benefits							5,112
Deferred income tax liability							(1,079)
Retained earnings							(4,121)
Accumulated other comprehensive income (loss)							76
Removal of related amounts in accumulated other comprehensive income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables							0
Deferred policy acquisition costs and value of business acquired							4,007
Other assets							42
Future policy benefits							(7,911)
Policyholder Account Balance							0
Other Policy-Related Balances							1,043
Market risk benefits							0
Deferred income tax liability							2,405
Retained earnings							0
Accumulated other comprehensive income (loss)							8,512
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables							32
Deferred policy acquisition costs and value of business acquired							0
Other assets							0
Future policy benefits							719
Policyholder Account Balance							0
Other Policy-Related Balances							0
Market risk benefits							0
Deferred income tax liability							(160)
Retained earnings							(527)
Accumulated other comprehensive income (loss)							0
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables							351
Deferred policy acquisition costs and value of business acquired							0
Other assets							0
Future policy benefits							34,119
Policyholder Account Balance							0
Other Policy-Related Balances							0
Market risk benefits							0
Deferred income tax liability							(7,438)
Retained earnings							0
Accumulated other comprehensive income (loss)							(26,330)
Adjustments for the cumulative effect of adoption on additional insurance assets and liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables							19
Deferred policy acquisition costs and value of business acquired							0
Other assets							0
Future policy benefits							83
Policyholder Account Balance							0
Other Policy-Related Balances							0
Market risk benefits							0
Deferred income tax liability							(13)
Retained earnings							(42)
Accumulated other comprehensive income (loss)							(9)
Other balance sheet reclassifications upon adoption of the LDTI standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Premiums, reinsurance and other receivables							(32)
Deferred policy acquisition costs and value of business acquired							21
Other assets							15
Future policy benefits							(7,490)
Policyholder Account Balance							7,519
Other Policy-Related Balances							(40)
Market risk benefits							0
Deferred income tax liability							0
Retained earnings							23
Accumulated other comprehensive income (loss)							$ (6)