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Investment in Cenovus Energy - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Gain on investment in Cenovus Energy	$ 0	$ 251
Cenovus Energy Inc
Debt and Equity Securities, FV-NI [Line Items]
Gain on investment in Cenovus Energy		$ 251
Common Stock | Cenovus Energy Inc
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, shares sold (in shares)		91
Proceeds received from sale of equity securities		$ 1,400

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Equity Securities, FV-NI , Shares Sold

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Amount of unrealized and realized gain (loss) on 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 19
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3444-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
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-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713

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