Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 332,957	$ 354,470
Allowance for Credit Losses		92	133
Fair Value	[1]	373,252	412,905
Amortized Cost	[1]	1,644	1,930
Fair Value		1,956	2,298
Allowance for Credit Losses		6	9
Held-for-sale
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		14,985
Fair Value		15,643
Fixed maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		332,957	354,470
Gross Unrealized Gains		42,067	59,548
Gross Unrealized Losses		1,680	980
Allowance for Credit Losses		92	133
Fair Value		373,252	412,905
Amortized Cost		1,650	1,939
Gross Unrealized Gains		306	359
Gross Unrealized Losses		0	0
Fair Value		1,956	2,298
Allowance for Credit Losses		6	9
Amortized Cost, Net of Allowance		1,644	1,930
Fixed maturities | Held-for-sale
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		14,985
Gross Unrealized Gains		783
Gross Unrealized Losses		123
Allowance for Credit Losses		2
Fair Value		15,643
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		27,512	30,766
Gross Unrealized Gains		5,491	9,699
Gross Unrealized Losses		97	17
Allowance for Credit Losses		0	0
Fair Value		32,906	40,448
Fixed maturities | Obligations of U.S. states and their political subdivisions
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		10,444	10,668
Gross Unrealized Gains		1,774	2,144
Gross Unrealized Losses		15	1
Allowance for Credit Losses		0	0
Fair Value		12,203	12,811
Fixed maturities | Foreign government bonds
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		85,627	94,110
Gross Unrealized Gains		12,594	16,373
Gross Unrealized Losses		475	239
Allowance for Credit Losses		0	0
Fair Value		97,746	110,244
Amortized Cost		859	935
Gross Unrealized Gains		235	270
Gross Unrealized Losses		0	0
Fair Value		1,094	1,205
Allowance for Credit Losses		0	0
Amortized Cost, Net of Allowance		859	935
Fixed maturities | U.S. public corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		97,127	95,299
Gross Unrealized Gains		13,819	18,516
Gross Unrealized Losses		452	213
Allowance for Credit Losses		12	47
Fair Value		110,482	113,555
Fixed maturities | U.S. private corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		34,035	36,894
Gross Unrealized Gains		2,903	4,196
Gross Unrealized Losses		150	134
Allowance for Credit Losses		54	19
Fair Value		36,734	40,937
Fixed maturities | Foreign public corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		24,995	25,857
Gross Unrealized Gains		2,806	3,768
Gross Unrealized Losses		95	64
Allowance for Credit Losses		18	24
Fair Value		27,688	29,537
Amortized Cost		500	651
Gross Unrealized Gains		54	68
Gross Unrealized Losses		0	0
Fair Value		554	719
Allowance for Credit Losses		6	9
Amortized Cost, Net of Allowance		494	642
Fixed maturities | Foreign private corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		26,712	28,668
Gross Unrealized Gains		1,669	3,183
Gross Unrealized Losses		355	226
Allowance for Credit Losses		8	33
Fair Value		28,018	31,592
Amortized Cost		81	87
Gross Unrealized Gains		1	1
Gross Unrealized Losses		0	0
Fair Value		82	88
Allowance for Credit Losses		0	0
Amortized Cost, Net of Allowance		81	87
Fixed maturities | Asset-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		11,120	14,489
Gross Unrealized Gains		140	176
Gross Unrealized Losses		15	74
Allowance for Credit Losses		0	0
Fair Value		11,245	14,591
Fixed maturities | Commercial mortgage-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		12,480	15,036
Gross Unrealized Gains		728	1,288
Gross Unrealized Losses		14	11
Allowance for Credit Losses		0	10
Fair Value		13,194	16,303
Fixed maturities | Residential mortgage-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		2,905	2,683
Gross Unrealized Gains		143	205
Gross Unrealized Losses		12	1
Allowance for Credit Losses		0	0
Fair Value		3,036	2,887
Amortized Cost		210	266
Gross Unrealized Gains		16	20
Gross Unrealized Losses		0	0
Fair Value		226	286
Allowance for Credit Losses		0	0
Amortized Cost, Net of Allowance		210	266
Prudential Netting Agreement | Fixed maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		5,000	4,998
Fair Value		5,727	5,821
Prudential Netting Agreement | Fixed maturities | U.S. private corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		5,616	5,966
Fair Value		$ 5,693	$ 6,100

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