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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
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, 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 
 December 31, 2022
 Cost BasisUnrealized
Gains
Unrealized
Losses
Fair Value
 (in millions)
Cash$153 $— $— $153 
Cash equivalents:
U.S. and Canadian government obligations1,902 — — 1,902 
Other debt securities268 — — 268 
Total cash and cash equivalents$2,323 $— $— $2,323 
Nonqualified employee benefit trusts16 — — 16 
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, 2023 and 2022 that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine such fair value:
 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)— 
 December 31, 2022
 Total Fair ValueQuoted Prices
in Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash equivalents$2,170 $2,170 $— $— 
Nonqualified employee benefit trusts16 16 — — 
Derivative assets12 — 12 — 
Derivative liabilities(85)— (85)— 
Schedule of carrying amounts and estimated fair values of financial instruments
The carrying amounts and estimated fair values of our financial instruments are as follows:
 December 31, 2023December 31, 2022
 Carrying
Amount
Fair ValueCarrying
Amount
Fair Value
 (in millions)
Long-term debt$2,968 $2,894 $2,965 $2,764