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Other Revenues and Other Expenses Other Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,245 | $ 2,229 | $ 2,110
Other revenues | 2,601 | 2,526 | 2,630
Vision fee for service arrangements |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 536 | 598 | 566
Prepaid legal plans |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 572 | 516 | 471
Fee-based investment management |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 394 | 408 | 396
ASO contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 273 | 259 | 238
Recordkeeping and administrative services (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 151 | 150 | 168
Other revenue from service contracts from customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 319 | 298 | 271
Other Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other revenues | $ 356 | $ 297 | $ 520

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