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Other Revenues and Other Expenses Other Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 577 | $ 562
Other revenues | 674 | 639
Vision fee for service arrangements |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 146 | 159
Prepaid legal plans |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 148 | 131
Fee-based investment management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 98 | 100
Administrative services-only contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 67 | 64
Recordkeeping and administrative services (1) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 38 | 37
Other revenue from service contracts from customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 80 | 71
Other Income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | $ 97 | $ 77

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