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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of cash and cash equivalents and other investments reconciliation from adjusted cost to fair value
Our cash and cash equivalents and other investments consist of the following:
 December 31, 2024
 Cost BasisUnrealized
Gains
Unrealized
Losses
Fair Value
 (in millions)
Cash$168 $— $— $168 
Cash equivalents:
U.S. and Canadian government obligations932 — — 932 
Other debt securities514 — — 514 
Total cash and cash equivalents$1,614 $— $— $1,614 
Nonqualified employee benefit trusts15 — 17 
 December 31, 2023
 Cost BasisUnrealized
Gains
Unrealized
Losses
Fair Value
 (in millions)
Cash$208 $— $— $208 
Cash equivalents:
U.S. and Canadian government obligations1,488 — — 1,488 
Other debt securities336 — — 336 
Total cash and cash equivalents$2,032 $— $— $2,032 
Nonqualified employee benefit trusts16 — 17 
Schedule of assets and liabilities measured at fair value on a recurring basis
The following tables present assets and liabilities included in our consolidated balance sheets as of December 31, 2024 and 2023 that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine such fair value:
 December 31, 2024
 Total Fair ValueQuoted Prices
in Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash equivalents$1,446 $1,446 $— $— 
Nonqualified employee benefit trusts17 17 — — 
Derivative assets— — 
Derivative liabilities(3)— (3)— 
 December 31, 2023
 Total Fair ValueQuoted Prices
in Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash equivalents$1,824 $1,824 $— $— 
Nonqualified employee benefit trusts17 17 — — 
Derivative assets— — 
Derivative liabilities(35)— (35)— 
Schedule of carrying amounts and estimated fair values of financial instruments
The carrying amount and estimated fair value of our financial instruments are as follows:
 December 31, 2024December 31, 2023
 Carrying
Amount
Fair ValueCarrying
Amount
Fair Value
 (in millions)
Long-term debt$2,971 $2,827 $2,968 $2,894