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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2025

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, 2025
			Cost Basis						Unrealized Gains						Unrealized Losses						Fair Value
			(in millions)
Cash			$	206					$	—					$	—					$	206
Cash equivalents:
U.S. and Canadian government obligations			707						—						—						707
Other debt securities			493						—						—						493
Total cash and cash equivalents			$	1,406					$	—					$	—					$	1,406
Nonqualified employee benefit trusts			16						1						—						17

			December 31, 2024
			Cost Basis						Unrealized Gains						Unrealized Losses						Fair Value
			(in millions)
Cash			$	168					$	—					$	—					$	168
Cash equivalents:
U.S. and Canadian government obligations			932						—						—						932
Other debt securities			514						—						—						514
Total cash and cash equivalents			$	1,614					$	—					$	—					$	1,614
Nonqualified employee benefit trusts			15						2						—						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, 2025 and December 31, 2024 that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine such fair value:

			March 31, 2025
			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			$	1,200					$	1,200					$	—					$	—
Nonqualified employee benefit trusts			17						17						—						—
Derivative assets			1						—						1						—
Derivative liabilities			(2)						—						(2)						—

			December 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			$	1,446					$	1,446					$	—					$	—
Nonqualified employee benefit trusts			17						17						—						—
Derivative assets			4						—						4						—
Derivative liabilities			(3)						—						(3)						—

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, 2025												December 31, 2024
			Carrying Amount						Fair Value						Carrying Amount						Fair Value
			(in millions)
Long-term debt			$	2,972					$	2,822					$	2,971					$	2,827

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- Definition

Tabular disclosure of investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/320/tableOfContent

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Topic 321
-Publisher FASB
-URI https://asc.fasb.org/321/tableOfContent

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Topic 325
-Publisher FASB
-URI https://asc.fasb.org/325/tableOfContent

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- Definition

Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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