DEBT - Narrative (Details) $ in Millions			1 Months Ended	3 Months Ended
	Mar. 06, 2024 CAD ($)	Jan. 02, 2024 USD ($)	Apr. 30, 2024 USD ($) offer	Mar. 31, 2024 CAD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 CAD ($)
Line of Credit Facility [Line Items]
Commitment fee percentage				0.10%	0.10%
Long-term debt and lease obligation				$ 81,386,000,000			$ 74,715,000,000
Cumulative fair value adjustment, net				501,000,000			514,000,000
Long-Term Debt
Line of Credit Facility [Line Items]
Principal amount				200,000,000	$ 2,700
Subsequent event
Line of Credit Facility [Line Items]
Number of offering | offer			4
Debt instrument, face amount			$ 3,500
EOG Acquisition
Line of Credit Facility [Line Items]
Debt increased	$ 1,900,000,000
Long-term debt, maturing 2025						$ 500
Long-term debt, maturing after 2029						1,800
Cumulative fair value adjustment, net				(478,000,000)
RNG Facilities
Line of Credit Facility [Line Items]
Debt increased		$ 568
Long-term debt, maturing 2025						$ 606
Commercial paper and credit facility draws
Line of Credit Facility [Line Items]
Long-term debt and lease obligation				9,600,000,000			3,800,000,000
Three-Year Senior Notes | Subsequent event
Line of Credit Facility [Line Items]
Debt instrument maturity period (in years)			3 years
Five-Year Senior Notes | Subsequent event
Line of Credit Facility [Line Items]
Debt instrument maturity period (in years)			5 years
Ten-Year Senior Notes | Subsequent event
Line of Credit Facility [Line Items]
Debt instrument maturity period (in years)			10 years
Five-year medium term notes | Subsequent event
Line of Credit Facility [Line Items]
Debt instrument maturity period (in years)			30 years
Fixed-to-floating subordinated term notes | Subordinated term notes
Line of Credit Facility [Line Items]
Subordinated debt				13,200,000,000			13,000,000,000
Committed credit facilities
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				22,130,000,000
Unutilized amount of facility				11,696,000,000
Committed credit facilities | Term Loan Maturing In March 2049
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				200,000,000
Uncommitted demand credit facilities
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				1,200,000,000			1,100,000,000
Unutilized amount of facility				$ 766,000,000			$ 572,000,000