Investments (excluding Consolidated Investment Entities) - Composition of US and Foreign Corporate Securities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	$ 36,209	$ 35,836
Fixed maturities, available-for-sale, at fair value	40,938	39,663
Communications
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	1,665	1,694
Gross Unrealized Capital Gains	374	295
Gross Unrealized Capital Losses	1	0
Fixed maturities, available-for-sale, at fair value	2,038	1,989
Financial
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	3,949	4,067
Gross Unrealized Capital Gains	668	535
Gross Unrealized Capital Losses	9	1
Fixed maturities, available-for-sale, at fair value	4,608	4,601
Industrial and other companies
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	11,389	11,669
Gross Unrealized Capital Gains	1,692	1,274
Gross Unrealized Capital Losses	48	16
Fixed maturities, available-for-sale, at fair value	13,033	12,927
Energy
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	2,567	2,819
Gross Unrealized Capital Gains	333	368
Gross Unrealized Capital Losses	56	27
Fixed maturities, available-for-sale, at fair value	2,844	3,160
Utilities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	4,948	4,895
Gross Unrealized Capital Gains	790	561
Gross Unrealized Capital Losses	4	1
Fixed maturities, available-for-sale, at fair value	5,734	5,455
Transportation
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	1,224	1,206
Gross Unrealized Capital Gains	126	116
Gross Unrealized Capital Losses	22	2
Fixed maturities, available-for-sale, at fair value	1,328	1,320
Total
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	25,742	26,350
Gross Unrealized Capital Gains	3,983	3,149
Gross Unrealized Capital Losses	140	47
Fixed maturities, available-for-sale, at fair value	$ 29,585	$ 29,452

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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