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Fair Value Measurements (Tables)
3 Months Ended
Mar. 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:
 March 31, 2024
 Cost BasisUnrealized
Gains
Unrealized
Losses
Fair Value
 (in millions)
Cash$190 $— $— $190 
Cash equivalents:
U.S. and Canadian government obligations1,277 — — 1,277 
Other debt securities306 — — 306 
Total cash and cash equivalents$1,773 $— $— $1,773 
Nonqualified employee benefit trusts16 — 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 March 31, 2024 and December 31, 2023 that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine such fair value:
 March 31, 2024
 Total Fair
Value
Quoted Prices
in Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash equivalents$1,583 $1,583 $— $— 
Nonqualified employee benefit trusts17 17 — — 
Derivative assets— — 
Derivative liabilities(2)— (2)— 
 December 31, 2023
 Total Fair
Value
Quoted 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:
 March 31, 2024December 31, 2023
 Carrying
Amount
Fair ValueCarrying
Amount
Fair Value
 (in millions)
Long-term debt$2,969 $2,838 $2,968 $2,894