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Summary of Basis of Presentation and Recent Accounting Standards - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 8,650 $ 10,901
Other comprehensive loss (20) 20
Balance at end of period 7,408 10,066
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 45 (10)
Other comprehensive loss (20) 20
Balance at end of period 25 $ 10
Unrealized Gains (losses) on Available-for-Sale Debt Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 38  
Other comprehensive loss (17)  
Balance at end of period 21  
Pension and Postretirement Obligation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 4  
Other comprehensive loss 0  
Balance at end of period 4  
Gains (Losses) on Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 3  
Other comprehensive loss (3)  
Balance at end of period $ 0