v3.25.1
Shareholders' Equity - Tax Effects Allocated to Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Before Tax Amount    
Other comprehensive income (loss) $ 69 $ (36)
Tax (Expense) Benefit    
Other comprehensive income (loss) (3) 8
Net of Tax Amount    
Other comprehensive income (loss) 66 (28)
Unrealized (losses) gains on available-for-sale investments    
Before Tax Amount    
Before reclassifications 67 (41)
Tax (Expense) Benefit    
Before reclassifications (3) 8
Net of Tax Amount    
Before reclassifications 64 (33)
Other comprehensive income (loss) 66 (27)
Unrealized (losses) gains on available-for-sale investments, with allowance for credit loss    
Before Tax Amount    
Reclassification from AOCI   1
Net of Tax Amount    
Reclassification from AOCI   1
Unrealized (losses) gains on available-for-sale investments, without allowance for credit loss    
Before Tax Amount    
Reclassification from AOCI 2 5
Net of Tax Amount    
Reclassification from AOCI 2 5
Cumulative currency translation adjustment    
Before Tax Amount    
Before reclassifications   (1)
Net of Tax Amount    
Before reclassifications   (1)
Other comprehensive income (loss) $ 0 $ (1)