Investments (excluding Consolidated Investment Entities) - Composition of US and Foreign Corporate Securities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	$ 35,836	$ 36,268
Fixed maturities, including securities pledged	39,663	36,897
Total
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	26,350	28,129
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	3,149	1,031
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	47	685
Fixed maturities, including securities pledged	29,452	28,475
Communications
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	1,694	1,952
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	295	107
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	0	29
Fixed maturities, including securities pledged	1,989	2,030
Financial
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	4,067	4,131
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	535	199
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	1	70
Fixed maturities, including securities pledged	4,601	4,260
Industrial and other companies
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	11,669	12,707
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	1,274	371
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	16	330
Fixed maturities, including securities pledged	12,927	12,748
Energy
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	2,819	3,180
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	368	138
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	27	117
Fixed maturities, including securities pledged	3,160	3,201
Utilities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	4,895	5,120
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	561	189
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	1	114
Fixed maturities, including securities pledged	5,455	5,195
Transportation
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	1,206	1,039
Fixed maturities, including securities pledged, Gross Unrealized Capital Gains	116	27
Fixed maturities, including securities pledged,Gross Unrealized Capital Losses	2	25
Fixed maturities, including securities pledged	$ 1,320	$ 1,041

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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