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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance $ (3,541) $ (2,776) $ (2,720) $ (2,542)
Total realized/unrealized gains (losses) included in Net income 70 (223) (643) (286)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (63) (151) (276) (395)
Sales and settlements 65 45 170 118
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance [1] (3,469) (3,105) (3,469) (3,105)
Embedded derivatives        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance (3,541) (2,776) (2,720) (2,542)
Total realized/unrealized gains (losses) included in Net income 70 [2] (223) (643) [3] (286) [3]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (63) (151) (276) (395)
Sales and settlements 65 45 170 118
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance $ (3,469) $ (3,105) $ (3,469) $ (3,105)
[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.
[2]
Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects a favorable adjustment related to the unlocking of actuarial assumptions of $181 million in the third quarter of 2019.
[3]
Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects a favorable adjustment related to the unlocking of actuarial assumptions of $181 million in the first nine months of 2019 compared to a loss of $44 million in the first nine months of 2018.