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Derivative Financial Instruments - Narrative (Details) $ in Millions | Sep. 30, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract | Sep. 30, 2018 contract
--- | --- | --- | ---
Derivative Instruments, Gain (Loss) |  |  |
Derivative, number of instruments held | 26,885 | 26,170 |
Cash and securities pledged as collateral by counterparties | $ | $ 48 |  |
Securities pledged as collateral to counterparties | $ | 1 |  |
Collateral posted under MNAs for contracts containing credit-risk-contingent features | $ | 0 | $ 2 |
Cash and securities pledged in the form of margin deposits | $ | $ 50 |  |
Derivatives designated as fair value accounting hedging instruments |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivative, number of instruments held |  |  | 1
Fair Value Hedging | Derivatives designated as fair value accounting hedging instruments |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivative, number of instruments held | 1 |  |
Number of foreign currency derivatives held | 0 |  | 0
Cash Flow Hedging | Derivatives designated as fair value accounting hedging instruments |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Number of foreign currency derivatives held | 0 |  | 1

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- Definition This element represents securities pledged to counterparties as collateral for credit exposure. + References No definition available. + Details
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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=109980867&loc=SL5624258-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 + Details
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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of foreign currency exchange rate derivatives held by the entity at the reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 + Details
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