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Derivative Financial Instruments - Narrative (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) contract | Dec. 31, 2020 USD ($) contract
Embedded derivatives |  |
Derivative [Line Items] |  |
Term of contract, term one | 1 year |
Term of contract, term two | 2 years |
Term of contract, term three | 3 years |
Term of contract, term four | 5 years |
Call options | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Collateral posted | $ 636 | $ 491
Maximum amount of loss due to credit risk | 56 | 58
Call options | Derivatives for Trading and Investment | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Collateral posted | 636 | 491
Maximum amount of loss due to credit risk | 56 | 58
Call options | Cash and Cash Equivalents | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Collateral posted | $ 424 | $ 415
Futures contracts |  |
Derivative [Line Items] |  |
Number of instruments held | contract | 369,000,000 | 384,000,000
Collateral held | $ 4 |

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 + Details
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