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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 35,603	$ 35,612
Gross Unrealized Gains, fixed maturities, available-for-sale	703	1,466
Gross Unrealized Losses, fixed maturities, available-for-sale	(654)	(114)
Total fixed maturities	35,652	36,964
Non-Credit OTTI	(5)	(5)
Equity securities, available-for-sale, Cost or Amortized Cost	0	907
Equity securities, at fair value	0	1,012
Available-for-sale, Cost or Amortized Cost	35,603	36,519
Available-for-sale, Gross Unrealized Gains	703	1,587
Available-for-sale, Gross Unrealized Losses	(654)	(130)
Available-for-sale, Fair Value	35,652	37,976
Amortized Cost
One year or less	999	1,507
Over one year through five years	5,786	5,007
Over five years through ten years	6,611	6,505
Over ten years	12,629	13,928
Subtotal	26,025	26,947
Mortgage-backed and asset-backed securities	9,578	8,665
Fair Value
One year or less	1,002	1,513
Over one year through five years	5,791	5,119
Over five years through ten years	6,495	6,700
Over ten years	12,820	14,866
Subtotal	26,108	28,198
Mortgage-backed and asset-backed securities	9,544	8,766
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,272	1,119
Gross Unrealized Gains, fixed maturities, available-for-sale	5	9
Gross Unrealized Losses, fixed maturities, available-for-sale	(1)	(2)
Total fixed maturities	1,276	1,126
Non-Credit OTTI	0	0
Collateralized loan obligations (CLOs)
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,455	1,257
Gross Unrealized Gains, fixed maturities, available-for-sale	2	3
Gross Unrealized Losses, fixed maturities, available-for-sale	(20)	0
Total fixed maturities	1,437	1,260
Non-Credit OTTI	0	0
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,581	3,304
Gross Unrealized Gains, fixed maturities, available-for-sale	35	58
Gross Unrealized Losses, fixed maturities, available-for-sale	(64)	(26)
Total fixed maturities	3,552	3,336
Non-Credit OTTI	(5)	(5)
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	13,696	12,370
Gross Unrealized Gains, fixed maturities, available-for-sale	148	490
Gross Unrealized Losses, fixed maturities, available-for-sale	(446)	(56)
Total fixed maturities	13,398	12,804
Non-Credit OTTI	0	0
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	866	1,071
Gross Unrealized Gains, fixed maturities, available-for-sale	7	43
Gross Unrealized Losses, fixed maturities, available-for-sale	(26)	(4)
Total fixed maturities	847	1,110
Non-Credit OTTI	0	0
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	9,972	11,743
Gross Unrealized Gains, fixed maturities, available-for-sale	421	754
Gross Unrealized Losses, fixed maturities, available-for-sale	(47)	(12)
Total fixed maturities	10,346	12,485
Non-Credit OTTI	0	0
Residential mortgage-backed securities (RMBS)
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,270	2,985
Gross Unrealized Gains, fixed maturities, available-for-sale	44	63
Gross Unrealized Losses, fixed maturities, available-for-sale	(35)	(4)
Total fixed maturities	3,279	3,044
Non-Credit OTTI	0	0
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,491	1,763
Gross Unrealized Gains, fixed maturities, available-for-sale	41	46
Gross Unrealized Losses, fixed maturities, available-for-sale	(15)	(10)
Total fixed maturities	1,517	1,799
Non-Credit OTTI	0	0
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Non-Credit OTTI		0
Equity securities, available-for-sale, Cost or Amortized Cost		907
Gross Unrealized Gains, fixed maturities, available-for-sale		121
Gross Unrealized Losses Gains, fixed maturities, available-for-sale		(16)
Equity securities, at fair value		$ 1,012

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