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Summary of Significant Accounting Policies - Other Intangibles (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Intangibles      
Gross $ 3,543 $ 3,543  
Accumulated amortization (1,783) (1,586)  
Net carrying amount 1,760 1,957  
Amortization expense 197 $ 202 $ 253
Estimated amortization expense:      
2025 193    
2026 191    
2027 191    
2028 190    
2029 $ 189