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Variable Interest Entities (Assets and Liabilities of Consolidated VIEs) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		$ 907,280	$ 940,722
Notes issued by consolidated VIEs		848,504	872,512
Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		4,449	4,292
Notes issued by consolidated VIEs		801	561
Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		2,108	2,077
Notes issued by consolidated VIEs		0	2
Equity securities | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		57	42
Equity securities | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		0	0
Commercial mortgage and other loans | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		911	975
Commercial mortgage and other loans | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		0	0
Other | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		2,533	2,221
Other | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		133	127
Cash and cash equivalents | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		99	101
Cash and cash equivalents | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		0	0
Accrued investment income | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		1	2
Accrued investment income | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		3	4
Other assets | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		511	594
Other assets | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		873	768
Other liabilities | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Notes issued by consolidated VIEs		516	256
Other liabilities | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Notes issued by consolidated VIEs		0	2
Notes Issued by Consolidated VIEs | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Notes issued by consolidated VIEs	[1]	285	305
Notes Issued by Consolidated VIEs | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Notes issued by consolidated VIEs		0	0
Available-for-sale | Fixed maturities | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		102	110
Available-for-sale | Fixed maturities | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		275	296
Held-to-maturity | Fixed maturities | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		81	87
Held-to-maturity | Fixed maturities | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		824	882
Trading | Fixed maturities | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		154	160
Trading | Fixed maturities | Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		0	0
Wholly-owned beneficial interests | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		$ 2,495	$ 2,538
Maximum | Notes Issued by Consolidated VIEs | Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
VIEs Liabilities, maturities obligations (less than)		4 years
[1] See Note 4 for details of balances associated with variable interest entities.

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