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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 39,429	$ 35,603
Gross Unrealized Gains, fixed maturities, available-for-sale	1,805	703
Gross Unrealized Losses, fixed maturities, available-for-sale	(68)	(654)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	41,166	35,652
Non-Credit OTTI	(4)	(5)
Amortized Cost
One year or less	1,094	999
Over one year through five years	7,164	5,786
Over five years through ten years	7,580	6,611
Over ten years	12,400	12,629
Subtotal	28,238	26,025
Mortgage-backed and asset-backed securities	11,191	9,578
Fair Value
One year or less	1,100	1,002
Over one year through five years	7,332	5,791
Over five years through ten years	7,910	6,495
Over ten years	13,399	12,820
Subtotal	29,741	26,108
Mortgage-backed and asset-backed securities	11,425	9,544
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,010	1,272
Gross Unrealized Gains, fixed maturities, available-for-sale	19	5
Gross Unrealized Losses, fixed maturities, available-for-sale	0	(1)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	1,029	1,276
Non-Credit OTTI	0	0
CLOs
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,929	1,455
Gross Unrealized Gains, fixed maturities, available-for-sale	4	2
Gross Unrealized Losses, fixed maturities, available-for-sale	(8)	(20)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	1,925	1,437
Non-Credit OTTI	0	0
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,774	3,581
Gross Unrealized Gains, fixed maturities, available-for-sale	139	35
Gross Unrealized Losses, fixed maturities, available-for-sale	(8)	(64)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,905	3,552
Non-Credit OTTI	(4)	(5)
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	16,078	13,696
Gross Unrealized Gains, fixed maturities, available-for-sale	718	148
Gross Unrealized Losses, fixed maturities, available-for-sale	(48)	(446)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	16,748	13,398
Non-Credit OTTI	0	0
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,025	866
Gross Unrealized Gains, fixed maturities, available-for-sale	48	7
Gross Unrealized Losses, fixed maturities, available-for-sale	(1)	(26)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	1,072	847
Non-Credit OTTI	0	0
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	9,568	9,972
Gross Unrealized Gains, fixed maturities, available-for-sale	710	421
Gross Unrealized Losses, fixed maturities, available-for-sale	0	(47)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	10,278	10,346
Non-Credit OTTI	0	0
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,478	3,270
Gross Unrealized Gains, fixed maturities, available-for-sale	90	44
Gross Unrealized Losses, fixed maturities, available-for-sale	(2)	(35)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	4,566	3,279
Non-Credit OTTI	0	0
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,567	1,491
Gross Unrealized Gains, fixed maturities, available-for-sale	77	41
Gross Unrealized Losses, fixed maturities, available-for-sale	(1)	(15)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	1,643	1,517
Non-Credit OTTI	$ 0	$ 0

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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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