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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, 2019
Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial liabilities, Beginning Balance $ (2,720) $ (2,542)
Total realized/unrealized gains (losses) included in Net income (462) 63
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances (112) (103)
Sales and settlements 47 33
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Financial liabilities, Ending Balance [1] (3,247) (2,549)
Embedded derivatives    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial liabilities, Beginning Balance (2,720) (2,542)
Total realized/unrealized gains (losses) included in Net income (462) 63
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances (112) (103)
Sales and settlements 47 33
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Financial liabilities, Ending Balance $ (3,247) $ (2,549)
[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.