v3.26.1
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 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period $ 7,408 $ 8,650 $ 10,066 $ 8,650 $ 10,901
Other comprehensive loss (6) (20) 13 (26) 33
Balance at end of period 6,761 7,408 9,399 6,761 9,399
Total          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period 25 45 10 45 (10)
Other comprehensive loss (6)   13 (26) 33
Balance at end of period 19 25 $ 23 19 $ 23
Unrealized Gains (losses) on Available-for-Sale Debt Securities          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period 21 38   38  
Other comprehensive loss (5) (17)      
Balance at end of period 16 21   16  
Pension and Postretirement Obligation Adjustments          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period 4 4   4  
Other comprehensive loss 0 0      
Balance at end of period 4 4   4  
Gains (Losses) on Foreign Currency Translation          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period 0 3   3  
Other comprehensive loss (1) (3)      
Balance at end of period $ (1) $ 0   $ (1)