Business, Basis of Presentation and Summary of Significant Accounting Policies - Summary Matrix (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 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	$ 18,692	$ 17,364			$ 18,169
Deferred policy acquisition costs and value of business acquired	19,976	19,653	$ 19,746		20,417
Other assets	12,006	11,025			11,742
Future policy benefits		187,222			224,358
Policyholder Account Balance	212,569	210,597			211,737
Other Policy-Related Balances	19,598	18,424			18,032
Market risk benefits	3,869	3,763			7,901
Deferred income tax liability	1,111	950			4,723
Retained earnings	39,957	40,332			31,824
Accumulated other comprehensive income (loss)	$ (19,147)	(22,621)	$ (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)