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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 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 $ (2) $ (6) $ (6) $ (5)
Debt and Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   471   447
Beginning balance, including held for sale assets 422   447  
Losses included in Shareholders' net income (40) (1) (61) 0
Losses included in Other comprehensive loss (2) (5) (5) 0
Purchases, sales and settlements        
Purchases 11 0 11 4
Settlements (1) (18) (15) (27)
Total purchases, sales and settlements 10 (18) (4) (23)
Transfers into / (out of) Level 3        
Transfers into Level 3 15 32 31 71
Transfers out of Level 3 (8) (25) (11) (41)
Total transfers into / (out of) Level 3 7 7 20 30
Ending balance   454   454
Ending balance, including held for sale assets 397   397  
Total losses included in Shareholders' net income attributable to instruments held at the reporting date $ (41) $ (1) $ (61) $ 0