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Fair Value Measurements - Changes in Level 3 Financial Assets and Financial Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Transfers into/(out of) Level 3    
Change in unrealized gain or (loss) included in Other comprehensive loss for assets held at the end of the reporting period $ (4) $ 5
Debt and Equity Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance   447
Beginning balance, including held for sale assets 447  
(Losses) gains included in Shareholders' net (loss) income (21) 1
(Losses) gains included in Other comprehensive loss (3) 5
Purchases, sales and settlements    
Purchases 0 4
Settlements (14) (9)
Total purchases, sales and settlements (14) (5)
Transfers into/(out of) Level 3    
Transfers into Level 3 16 39
Transfers out of Level 3 (3) (16)
Total transfers into/(out of) Level 3 13 23
Ending balance   471
Ending balance, including held for sale assets 422  
Total (losses) gains included in Shareholders' net (loss) income attributable to instruments held at the reporting date $ (21) $ 1