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Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | $ 1,566 | $ 3,057
Twelve months or less below amortized cost, Unrealized Capital Loss | 52 | 107
More than twelve months below amortized cost, Fair Value | 13,555 | 14,784
More than twelve months below amortized cost, Unrealized Capital Loss | 2,090 | 2,739
Total, Fair Value | 15,121 | 17,841
Total Unrealized Capital Losses | 2,142 | 2,846
U.S. Treasuries |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 140 | 304
Twelve months or less below amortized cost, Unrealized Capital Loss | 3 | 20
More than twelve months below amortized cost, Fair Value | 262 | 133
More than twelve months below amortized cost, Unrealized Capital Loss | 40 | 32
Total, Fair Value | 402 | 437
Total Unrealized Capital Losses | 43 | 52
US Government Agencies Debt Securities |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 0 | 14
Twelve months or less below amortized cost, Unrealized Capital Loss | 0 | 0
More than twelve months below amortized cost, Fair Value | 0 | 0
More than twelve months below amortized cost, Unrealized Capital Loss | 0 | 0
Total, Fair Value | 0 | 14
Total Unrealized Capital Losses | 0 | 0
State, municipalities and political subdivisions |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 6 | 7
Twelve months or less below amortized cost, Unrealized Capital Loss | 1 | 0
More than twelve months below amortized cost, Fair Value | 500 | 562
More than twelve months below amortized cost, Unrealized Capital Loss | 95 | 117
Total, Fair Value | 506 | 569
Total Unrealized Capital Losses | 96 | 117
U.S. corporate public securities |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 518 | 818
Twelve months or less below amortized cost, Unrealized Capital Loss | 34 | 35
More than twelve months below amortized cost, Fair Value | 4,135 | 4,215
More than twelve months below amortized cost, Unrealized Capital Loss | 830 | 1,019
Total, Fair Value | 4,653 | 5,033
Total Unrealized Capital Losses | 864 | 1,054
U.S. corporate private securities |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 205 | 546
Twelve months or less below amortized cost, Unrealized Capital Loss | 4 | 13
More than twelve months below amortized cost, Fair Value | 2,494 | 2,845
More than twelve months below amortized cost, Unrealized Capital Loss | 201 | 316
Total, Fair Value | 2,699 | 3,391
Total Unrealized Capital Losses | 205 | 329
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 | 167 | 450
Twelve months or less below amortized cost, Unrealized Capital Loss | 3 | 17
More than twelve months below amortized cost, Fair Value | 1,201 | 1,285
More than twelve months below amortized cost, Unrealized Capital Loss | 204 | 270
Total, Fair Value | 1,368 | 1,735
Total Unrealized Capital Losses | 207 | 287
Foreign corporate private securities |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 73 | 490
Twelve months or less below amortized cost, Unrealized Capital Loss | 1 | 12
More than twelve months below amortized cost, Fair Value | 1,181 | 1,468
More than twelve months below amortized cost, Unrealized Capital Loss | 54 | 157
Total, Fair Value | 1,254 | 1,958
Total Unrealized Capital Losses | 55 | 169
Residential mortgage-backed |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 256 | 311
Twelve months or less below amortized cost, Unrealized Capital Loss | 3 | 8
More than twelve months below amortized cost, Fair Value | 1,189 | 1,210
More than twelve months below amortized cost, Unrealized Capital Loss | 205 | 253
Total, Fair Value | 1,445 | 1,521
Total Unrealized Capital Losses | 208 | 261
Commercial mortgage-backed securities |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 64 | 24
Twelve months or less below amortized cost, Unrealized Capital Loss | 1 | 0
More than twelve months below amortized cost, Fair Value | 2,302 | 2,751
More than twelve months below amortized cost, Unrealized Capital Loss | 429 | 532
Total, Fair Value | 2,366 | 2,775
Total Unrealized Capital Losses | 430 | 532
Other asset-backed securities |  |
Available-for-sale Securities, Including Securities Pledged [Line Items] |  |
Twelve months or less below amortized cost, Fair Value | 137 | 93
Twelve months or less below amortized cost, Unrealized Capital Loss | 2 | 2
More than twelve months below amortized cost, Fair Value | 291 | 315
More than twelve months below amortized cost, Unrealized Capital Loss | 32 | 43
Total, Fair Value | 428 | 408
Total Unrealized Capital Losses | $ 34 | $ 45

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