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Fair Value Measurements - Changes in balances of Level 3 financial liabilities carried at fair value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial liabilities, Beginning Balance $ (23) $ (3,933)
Total realized/unrealized gains (losses) included in Net income 0 (40)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances 0 (74)
Sales and settlements 0 93
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Financial liabilities, Ending Balance (23) (3,954)
Contingent consideration — acquisitions    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial liabilities, Beginning Balance (23)  
Total realized/unrealized gains (losses) included in Net income 0  
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0  
Purchases and issuances 0  
Sales and settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Financial liabilities, Ending Balance $ (23)  
Liabilities of discontinued annuity operations | Annuity subsidiaries    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial liabilities, Beginning Balance   (3,933)
Total realized/unrealized gains (losses) included in Net income   (40)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)   0
Purchases and issuances   (74)
Sales and settlements   93
Transfer into Level 3   0
Transfer out of Level 3   0
Financial liabilities, Ending Balance   $ (3,954)