Debt, Narrative (Details) - USD ($)			6 Months Ended
		Apr. 12, 2021	Jun. 30, 2021		Jun. 30, 2020	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
364-Day Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility expired, not renewed		$ 875,000,000
IEnova Revolver [Member] | Line of Credit [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Central Mexico Terminals [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 743,000,000	$ 660,000,000
Interest rate at period end (percent)			3.546%						3.87%
Senior Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of senior long-term debt					$ 1,499,000,000
Line of Credit [Member] | DGD Revolver [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Diamond Green Diesel Holdings LLC [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 400,000,000	[1]				$ 400,000,000
Option to increase aggregate commitments under line of credit facility, increase limit, subject to certain restrictions								550,000,000
Borrowings from long-term lines of credit			0
Repayments of long-term lines of credit			0
Line of Credit [Member] | DGD Revolver Letter Of Credit [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Diamond Green Diesel Holdings LLC [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 10,000,000
Line of Credit [Member] | IEnova Revolver [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Central Mexico Terminals [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	[1]		$ 743,000,000
Senior Notes Due April 15, 2023 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Face amount of long-term debt issuance					$ 850,000,000
Stated rate on debt instrument (percent)					2.70%
Senior Notes Due April 15, 2025, Issued April 2020 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Face amount of long-term debt issuance					$ 650,000,000
Stated rate on debt instrument (percent)					2.85%

[1] Creditors of our VIEs do not have recourse against us.