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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 10,901 $ 13,854 $ 19,123
Other comprehensive income 55 113 247
Balance at end of period 8,650 10,901 13,854
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (10) (123) (370)
Other comprehensive income 55 113 247
Balance at end of period 45 (10) (123)
Unrealized Gains on Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 10 (114)  
Other comprehensive income 28 124  
Balance at end of period 38 10 (114)
Pension and Postretirement Obligation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (12) (9)  
Other comprehensive income 16 (3)  
Balance at end of period 4 (12) (9)
Losses (gains) on Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (8) 0  
Other comprehensive income 11 (8)  
Balance at end of period $ 3 $ (8) $ 0