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Investments - Unrealized Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 22,400 $ 25,731
Gross Unrealized Losses 2,236 2,995
Additional impairment losses 0  
AAA    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 1,277 1,524
Gross Unrealized Losses 221 261
AA    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 3,641 3,817
Gross Unrealized Losses 547 658
A    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 5,229 5,652
Gross Unrealized Losses 405 517
BBB    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 9,243 11,523
Gross Unrealized Losses 689 1,095
U.S. Government, Government agencies and Government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 2,127 2,273
Gross Unrealized Losses 265 309
Non-investment grade    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 883 942
Gross Unrealized Losses $ 109 $ 155