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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 41,561	$ 40,078
Debt Securities, Available-for-sale, Allowance for Credit Loss	(23)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	3,560	2,125
Gross Unrealized Losses, fixed maturities, available-for-sale	(63)	(55)
Total fixed maturities	45,035	42,148
Non-Credit OTTI		(4)
Amortized Cost
One year or less	1,411	1,082
Over one year through five years	7,832	7,200
Over five years through ten years	7,622	7,395
Over ten years	12,206	11,769
Subtotal	29,071	27,446
Mortgage-backed and asset-backed securities	12,490	12,632
Fair Value
One year or less	1,432	1,090
Over one year through five years	8,286	7,401
Over five years through ten years	8,354	7,803
Over ten years	14,028	12,988
Subtotal	32,100	29,282
Mortgage-backed and asset-backed securities	12,935	12,866
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,525	1,461
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Gross Unrealized Gains, fixed maturities, available-for-sale	39	18
Gross Unrealized Losses, fixed maturities, available-for-sale	0	(3)
Total fixed maturities	1,564	1,476
Non-Credit OTTI		0
Collateralized loan obligations ("CLOs")
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,780	2,186
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Gross Unrealized Gains, fixed maturities, available-for-sale	7	5
Gross Unrealized Losses, fixed maturities, available-for-sale	(7)	(8)
Total fixed maturities	2,780	2,183
Non-Credit OTTI		0
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,219	4,210
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Gross Unrealized Gains, fixed maturities, available-for-sale	286	141
Gross Unrealized Losses, fixed maturities, available-for-sale	(21)	(13)
Total fixed maturities	4,484	4,338
Non-Credit OTTI		(4)
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	18,401	16,435
Debt Securities, Available-for-sale, Allowance for Credit Loss	(23)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	1,926	986
Gross Unrealized Losses, fixed maturities, available-for-sale	(31)	(25)
Total fixed maturities	20,273	17,396
Non-Credit OTTI		0
Foreign government/government agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	842	1,057
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Gross Unrealized Gains, fixed maturities, available-for-sale	77	66
Gross Unrealized Losses, fixed maturities, available-for-sale	0	0
Total fixed maturities	919	1,123
Non-Credit OTTI		0
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	8,564	8,763
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Gross Unrealized Gains, fixed maturities, available-for-sale	940	737
Gross Unrealized Losses, fixed maturities, available-for-sale	(1)	(2)
Total fixed maturities	9,503	9,498
Non-Credit OTTI		0
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,966	4,775
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Gross Unrealized Gains, fixed maturities, available-for-sale	144	97
Gross Unrealized Losses, fixed maturities, available-for-sale	(3)	(3)
Total fixed maturities	4,107	4,869
Non-Credit OTTI		0
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,264	1,191
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Gross Unrealized Gains, fixed maturities, available-for-sale	141	75
Gross Unrealized Losses, fixed maturities, available-for-sale	0	(1)
Total fixed maturities	$ 1,405	1,265
Non-Credit OTTI		$ 0

X

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

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+ References

No definition available.

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