Significant Accounting Policies and Pronouncements (Summary of Transition Impact) (Details) - USD ($) $ in Millions		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021		Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturities, held-to-maturity		$ 0		$ 1,298
Commercial mortgage and other loans	[1]	59,305		56,745
Other invested assets	[1]	22,855		21,099
Deferred policy acquisition cost		20,856		20,546	[2]	$ 19,763		$ 20,763
Other Assets	[1]	13,179	[3]	12,686	[2],[4]
Total assets		(721,123)		(689,029)
Policyholder's dividends		1,475		694
Other liabilities	[1]	16,071		15,720	[2],[4]
Income tax Liabilities		0		277	[2]
Total liabilities		691,336		657,110
Total equity		29,263		31,548	[5]	30,322	[5]		$ 68,210
TOTAL LIABILITIES AND EQUITY		721,123		689,029
Commercial mortgage and agricultural property loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net loans		58,726		56,133
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity		(6,504)		(3,806)	[5]	(9,493)	[5]		30,738
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity		$ 32,352		$ 31,714	[5]	$ 35,183	[5]		$ 30,749

[1] See Note 4 for details of balances associated with variable interest entities.

[2] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.

[3] See Note 24 for additional information regarding related party transactions.

[4] Prior period amounts have been reclassified to conform to current period presentation.

[5] Prior period amounts adjusted for the adoption of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.