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Investment in Cenovus Energy - Narrative (Details) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) shares
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, shares sold (in shares) | shares	91
Cenovus Energy Inc
Debt and Equity Securities, FV-NI [Line Items]
Net gain | $	$ 251
Common Stock | Cenovus Energy Inc
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, shares sold (in shares) | shares	91
Proceeds received from sale of equity securities | $	$ 1,400

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
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-Name Accounting Standards Codification
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-Paragraph 4
-Publisher FASB
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Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 19
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-19

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6B
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B

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