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Summary of Significant Accounting Policies - Other Intangibles (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Intangibles |  |  |
Weighted Average Amortization Period | 11 years 3 months 18 days |  |
Gross | $ 3,543 | $ 3,382 |
Accumulated amortization | (1,586) | (1,573) |
Net carrying amount | 1,957 | 1,809 |
Amortization expense | 202 | $ 253 | $ 237
Estimated amortization expense: |  |  |
2024 | 198 |  |
2025 | 193 |  |
2026 | 191 |  |
2027 | 191 |  |
2028 | $ 190 |  |

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