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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance $ (2,549) $ (1,963) $ (2,542) $ (1,759)
Total realized/unrealized gains (losses) included in Net income (126) (112) (63) (259)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (141) (80) (244) (159)
Sales and settlements 40 26 73 48
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance [2] (2,776) [1] (2,129) (2,776) [1] (2,129)
Embedded derivatives        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial liabilities, Beginning Balance (2,549) (1,963) (2,542) (1,759)
Total realized/unrealized gains (losses) included in Net income (126) [3] (112) (63) [4] (259)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances (141) (80) (244) (159)
Sales and settlements 40 26 73 48
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial liabilities, Ending Balance $ (2,776) $ (2,129) $ (2,776) $ (2,129)
[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] 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.
[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 second quarter of 2018.
[4] 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.