Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt investments:	$ 539	$ 524
Other equity investments	34	34
Derivatives	196	193
Derivatives	(60)	(43)
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	3,153	3,793
Other equity investments	9	9
Derivatives	196	193
Total assets	3,897	4,529
Derivatives	(60)	(43)
Total liabilities	(60)	(43)
Fair Value, Recurring | AFS - Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt investments:	176	163
Fair Value, Recurring | AFS - Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt investments:	336	344
Fair Value, Recurring | AFS - US government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt investments:	27	27
Fair Value, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	3,153	3,793
Other equity investments	9	9
Total assets	3,162	3,802
Fair Value, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	196	193
Total assets	735	727
Derivatives	(60)	(43)
Total liabilities	(60)	(43)
Fair Value, Recurring | Level 2 | AFS - Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt investments:	176	163
Fair Value, Recurring | Level 2 | AFS - Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt investments:	336	344
Fair Value, Recurring | Level 2 | AFS - US government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt investments:	$ 27	$ 27