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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance $ (3,099) $ (3,247) $ (3,730) $ (2,720)
Total realized/unrealized gains (losses) included in Net income (601) (251) 46 (713)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (46) (101) (124) (213)
Sales and settlements 71 58 133 105
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance [1] (3,675) (3,541) (3,675) (3,541)
Embedded derivatives        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance (3,099) (3,247) (3,730) (2,720)
Total realized/unrealized gains (losses) included in Net income (601) (251) 46 (713)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (46) (101) (124) (213)
Sales and settlements 71 58 133 105
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance $ (3,675) $ (3,541) $ (3,675) $ (3,541)
[1] As previously discussed, these tables exclude the portion of MIE liabilities allocated to Level 3, which are derived from the fair value of the MIE assets.