v3.24.3
Fair Value Measurements and Guarantees (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Fair Value Assets and Liabilities Measured On Recurring Basis [Table Text Block]
The following table presents, by level within the fair value hierarchy, certain of our significant financial assets and liabilities. The carrying values of cash and cash equivalents, accounts receivable, accounts payable, and commercial paper approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.
Fair Value Measurements Using
Carrying
Amount		Fair
Value		Quoted
Prices In
Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
(Millions)
Assets (liabilities) at September 30, 2024:
Measured on a recurring basis:
ARO Trust investments$295 $295 $295 $— $— 
Commodity derivative assets (1)132 132 21 62 49 
Commodity derivative liabilities (1)(319)(319)— (317)(2)
Additional disclosures:
Long-term debt, including current portion(27,109)(27,248)— (27,248)— 
Guarantees(36)(28)— (12)(16)
Assets (liabilities) at December 31, 2023:
Measured on a recurring basis:
ARO Trust investments$269 $269 $269 $— $— 
Commodity derivative assets (2)310 310 141 112 57 
Commodity derivative liabilities (2)(285)(285)(3)(278)(4)
Interest rate derivatives
66— 6— 
Additional disclosures:
Long-term debt, including current portion(25,713)(25,553)— (25,553)— 
Guarantees(37)(28)— (12)(16)
(1)Commodity derivative assets and liabilities exclude $76 million of net cash collateral in Level 1.
(2)Commodity derivative assets and liabilities exclude $2 million of net cash collateral in Level 1.