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Fair Value Measurements - Changes in balances of Level 3 financial liabilities carried at fair value (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Financial liabilities, Beginning Balance | $ (2,720) | [1] | $ (2,542) | [2] | $ (1,759) |
Total realized/unrealized gains (losses) included in Net earnings | (919) |  | 204 |  | (589) |
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 |  | 0 |
Purchases and issuances | (333) |  | (545) |  | (300) |
Sales and settlements | 242 |  | 163 |  | 106 |
Transfer into Level 3 | 0 |  | 0 |  | 0 |
Transfer out of Level 3 | 0 |  | 0 |  | 0 |
Financial liabilities, Ending Balance | (3,730) | [3] | (2,720) | [1] | (2,542) | [2]
Embedded derivatives |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Financial liabilities, Beginning Balance | (2,720) |  | (2,542) |  | (1,759) |
Total realized/unrealized gains (losses) included in Net earnings | (919) | [4] | 204 | [5] | (589) | [6]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 |  | 0 |
Purchases and issuances | (333) |  | (545) |  | (300) |
Sales and settlements | 242 |  | 163 |  | 106 |
Transfer into Level 3 | 0 |  | 0 |  | 0 |
Transfer out of Level 3 | 0 |  | 0 |  | 0 |
Financial liabilities, Ending Balance | $ (3,730) |  | $ (2,720) |  | $ (2,542) |
[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] | 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.
[4] | Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives includes a favorable adjustment related to the unlocking of actuarial assumptions of $181 million in 2019.
[5] | Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives includes losses related to the unlocking of actuarial assumptions of $44 million in 2018.
[6] | Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives includes losses related to the unlocking of actuarial assumptions of $25 million in 2017.

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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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