Investments (excluding Consolidated Investment Entities) - Composition of US and Foreign Corporate Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	$ 35,955	$ 35,836
Fixed maturities, available-for-sale, at fair value	37,584	39,663
Communications
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	1,653	1,694
Gross Unrealized Capital Gains	227	295
Gross Unrealized Capital Losses	6	0
Fixed maturities, available-for-sale, at fair value	1,874	1,989
Financial
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	4,013	4,067
Gross Unrealized Capital Gains	365	535
Gross Unrealized Capital Losses	46	1
Fixed maturities, available-for-sale, at fair value	4,332	4,601
Industrial and other companies
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	11,511	11,669
Gross Unrealized Capital Gains	973	1,274
Gross Unrealized Capital Losses	248	16
Fixed maturities, available-for-sale, at fair value	12,236	12,927
Energy
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	2,692	2,819
Gross Unrealized Capital Gains	103	368
Gross Unrealized Capital Losses	294	27
Fixed maturities, available-for-sale, at fair value	2,501	3,160
Utilities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	4,921	4,895
Gross Unrealized Capital Gains	358	561
Gross Unrealized Capital Losses	77	1
Fixed maturities, available-for-sale, at fair value	5,202	5,455
Transportation
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	1,209	1,206
Gross Unrealized Capital Gains	63	116
Gross Unrealized Capital Losses	49	2
Fixed maturities, available-for-sale, at fair value	1,223	1,320
Total
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, amortized cost	25,999	26,350
Gross Unrealized Capital Gains	2,089	3,149
Gross Unrealized Capital Losses	720	47
Fixed maturities, available-for-sale, at fair value	$ 27,368	$ 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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