Investments - Components of the net unrealized gain on securities that is included in AOCI in the Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Unrealized gain on:
Pretax	$ 1,534	$ 1,091
Deferred Tax	(322)	(229)
Net	1,212	862
Total fixed maturities
Unrealized gain on:
Pretax	2,950	1,981
Deferred Tax	(619)	(416)
Net	2,331	1,565
Fixed maturities — annuity segment
Unrealized gain on:
Pretax	2,473	1,611
Deferred Tax	(519)	(338)
Net	1,954	1,273
Fixed maturities — all other
Unrealized gain on:
Pretax	477	370
Deferred Tax	(100)	(78)
Net	377	292
Deferred policy acquisition costs — annuity segment
Unrealized gain on:
Pretax	(1,049)	(681)
Deferred Tax	220	143
Net	(829)	(538)
Annuity benefits accumulated
Unrealized gain on:
Pretax	(377)	(219)
Deferred Tax	79	46
Net	(298)	(173)
Life, accident and health reserves
Unrealized gain on:
Pretax	(3)	(1)
Deferred Tax	1	0
Net	(2)	(1)
Unearned revenue
Unrealized gain on:
Pretax	13	11
Deferred Tax	(3)	(2)
Net	$ 10	$ 9