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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.

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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