Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) $ in Millions	Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 23,132	$ 5,313
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 3,107	$ 96
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	4,140	1,116
More than twelve months below amortized cost, Fair Value	$ 2,609	$ 908
More than twelve months below amortized cost, Unrealized Capital Loss	$ 741	$ 53
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	787	349
Total, Fair Value	$ 25,741	$ 6,221
Total Unrealized Capital Losses	$ 3,848	$ 149
Total, Number of securities | security	4,927	1,465
Percent of loss position	20.00%
U.S. Treasuries
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 137	$ 16
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 15	$ 0
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	20	8
More than twelve months below amortized cost, Fair Value	$ 27	$ 12
More than twelve months below amortized cost, Unrealized Capital Loss	$ 2	$ 0
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	6	2
Total, Fair Value	$ 164	$ 28
Total Unrealized Capital Losses	$ 17	$ 0
Total, Number of securities | security	26	10
State, municipalities and political subdivisions
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 809	$ 58
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 129	$ 1
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	304	22
More than twelve months below amortized cost, Fair Value	$ 3	$ 0
More than twelve months below amortized cost, Unrealized Capital Loss	$ 1	$ 0
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	5	0
Total, Fair Value	$ 812	$ 58
Total Unrealized Capital Losses	$ 130	$ 1
Total, Number of securities | security	309	22
U.S. corporate public securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 6,291	$ 1,425
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 1,095	$ 35
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	1,227	292
More than twelve months below amortized cost, Fair Value	$ 805	$ 115
More than twelve months below amortized cost, Unrealized Capital Loss	$ 356	$ 6
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	268	119
Total, Fair Value	$ 7,096	$ 1,540
Total Unrealized Capital Losses	$ 1,451	$ 41
Total, Number of securities | security	1,495	411
U.S. corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 3,736	$ 447
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 421	$ 5
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	393	34
More than twelve months below amortized cost, Fair Value	$ 294	$ 122
More than twelve months below amortized cost, Unrealized Capital Loss	$ 56	$ 18
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	18	9
Total, Fair Value	$ 4,030	$ 569
Total Unrealized Capital Losses	$ 477	$ 23
Total, Number of securities | security	411	43
Foreign corporate public securities and foreign governments
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 2,363	$ 534
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 385	$ 16
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	439	97
More than twelve months below amortized cost, Fair Value	$ 242	$ 28
More than twelve months below amortized cost, Unrealized Capital Loss	$ 104	$ 2
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	73	14
Total, Fair Value	$ 2,605	$ 562
Total Unrealized Capital Losses	$ 489	$ 18
Total, Number of securities | security	512	111
Foreign corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 2,863	$ 70
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 304	$ 1
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	235	7
More than twelve months below amortized cost, Fair Value	$ 14	$ 11
More than twelve months below amortized cost, Unrealized Capital Loss	$ 3	$ 0
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	3	1
Total, Fair Value	$ 2,877	$ 81
Total Unrealized Capital Losses	$ 307	$ 1
Total, Number of securities | security	238	8
Residential mortgage-backed
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 1,867	$ 704
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 188	$ 18
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	565	244
More than twelve months below amortized cost, Fair Value	$ 463	$ 294
More than twelve months below amortized cost, Unrealized Capital Loss	$ 99	$ 13
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	212	116
Total, Fair Value	$ 2,330	$ 998
Total Unrealized Capital Losses	$ 287	$ 31
Total, Number of securities | security	777	360
Commercial mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 3,310	$ 1,137
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 396	$ 12
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	541	191
More than twelve months below amortized cost, Fair Value	$ 542	$ 228
More than twelve months below amortized cost, Unrealized Capital Loss	$ 88	$ 10
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	98	32
Total, Fair Value	$ 3,852	$ 1,365
Total Unrealized Capital Losses	$ 484	$ 22
Total, Number of securities | security	639	223
Other asset-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 1,749	$ 922
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 173	$ 8
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	415	221
More than twelve months below amortized cost, Fair Value	$ 219	$ 98
More than twelve months below amortized cost, Unrealized Capital Loss	$ 32	$ 4
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	104	56
Total, Fair Value	$ 1,968	$ 1,020
Total Unrealized Capital Losses	$ 205	$ 12
Total, Number of securities | security	519	277
U.S. Government agencies and authorities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 7
Twelve months or less below amortized cost, Unrealized Capital Loss	$ 1
Twelve months or less below amortized cost, total number of securities in an unrealized loss position | security	1
More than twelve months below amortized cost, Fair Value	$ 0
More than twelve months below amortized cost, Unrealized Capital Loss	$ 0
More than twelve months below amortized cost, total number of securities in an unrealized loss position | security	0
Total, Fair Value	$ 7
Total Unrealized Capital Losses	$ 1
Total, Number of securities | security	1