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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Financial liabilities, Beginning Balance |  | $ (2,776) | $ (2,129) | $ (2,542) |  | $ (1,759)
Total realized/unrealized gains (losses) included in Net income |  | (223) | (127) | (286) |  | (386)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 0 | 0 |  | 0
Purchases and issuances |  | (151) | (65) | (395) |  | (224)
Sales and settlements |  | 45 | 28 | 118 |  | 76
Transfer into Level 3 |  | 0 | 0 | 0 |  | 0
Transfer out of Level 3 |  | 0 | 0 | 0 |  | 0
Financial liabilities, Ending Balance | [1],[2] | (3,105) | (2,293) | (3,105) |  | (2,293)
Embedded derivatives |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Financial liabilities, Beginning Balance |  | (2,776) | (2,129) | (2,542) |  | (1,759)
Total realized/unrealized gains (losses) included in Net income |  | (223) | (127) | (286) | [3] | (386)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 0 | 0 |  | 0
Purchases and issuances |  | (151) | (65) | (395) |  | (224)
Sales and settlements |  | 45 | 28 | 118 |  | 76
Transfer into Level 3 |  | 0 | 0 | 0 |  | 0
Transfer out of Level 3 |  | 0 | 0 | 0 |  | 0
Financial liabilities, Ending Balance |  | $ (3,105) | $ (2,293) | $ (3,105) |  | $ (2,293)
[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 first nine 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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