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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance $ (3,247) $ (2,549) $ (2,720) $ (2,542)
Total realized/unrealized gains (losses) included in Net income (251) (126) (713) (63)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (101) (141) (213) (244)
Sales and settlements 58 40 105 73
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance [1] (3,541) (2,776) (3,541) (2,776)
Embedded derivatives        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance (3,247) (2,549) (2,720) (2,542)
Total realized/unrealized gains (losses) included in Net income (251) (126) [2] (713) (63) [3]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (101) (141) (213) (244)
Sales and settlements 58 40 105 73
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance $ (3,541) $ (2,776) $ (3,541) $ (2,776)
[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 losses related to the unlocking of actuarial assumptions of $44 million in the second quarter of 2018.
[3]
Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects losses related to the unlocking of actuarial assumptions of $44 million in the first six months of 2018.