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Fair Value of Financial Instruments - Retail Customer Credit Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Fair Value Meaurements and Concentration of Credit Risk
Provision for credit losses (income recognized) due to loss mitigation efforts	$ 251	$ 11	$ 698
Winter Storm Uri
Derivative Fair Value Meaurements and Concentration of Credit Risk
Provision for credit losses (income recognized) due to loss mitigation efforts		$ (126)	$ 596

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No definition available.

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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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