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Derivative Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional value	$ 8,600,000,000
Net derivatives	24,000,000	$ 43,000,000
Estimated accumulated other comprehensive income to be reclassified in next 12 months	20,000,000
Cash collateral held relative to derivative exposure	0	0
Cash collateral pledged	24,000,000	$ 43,000,000
CHICAGO MERCANTILE EXCHANGE
Derivative [Line Items]
Notional value	$ 8,200,000,000
Percent of total notional derivative contracts	95.60%
Amount of variation margin included as settlement	$ (157,000,000)
London Clearing House
Derivative [Line Items]
Notional value	$ 400,000,000
Percent of total notional derivative contracts	4.40%
Amount of variation margin included as settlement	$ 15,000,000

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Amount Of Variation Margin Included As Settlement

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Derivative, Cash Collateral Held Relative to Derivative Exposure, Net

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Derivative Instrument, Percent of Total Notional Derivative Contracts

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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Nominal or face amount used to calculate payment on derivative.

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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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