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Income Taxes - Differences Between Statutory Income Tax Rate and Effective Income Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Increase (decrease) resulting from: |  |  |  |
Tax at statutory rate | $ 296 | $ 219 | $ 449 | $ 500
Tax-exempt income from municipal bonds | (6) | (5) | (17) | (16)
Dividend received exclusion | (5) | (6) | (16) | (16)
Other | 6 | 12 | 7 | 24
Total provision for income taxes | $ 291 | $ 220 | $ 423 | $ 492
Increase (decrease) resulting from: |  |  |  |
Tax at statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
Tax-exempt income from municipal bonds, Percent | (0.40%) | (0.50%) | (0.80%) | (0.70%)
Dividend received exclusion, Percent | (0.40%) | (0.60%) | (0.70%) | (0.70%)
Other | 0.40% | 1.30% | 0.30% | 1.10%
Provision for income taxes | 20.60% | 21.20% | 19.80% | 20.70%

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