v3.26.3
Fair Value Measurements (Detail) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 5,982 $ 9,261
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 1,380 2,274
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 4,602 6,987
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 39 173
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Corporate notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 3,297 4,793
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 12 11
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 1,128 1,263
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Mortgage-backed and asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 92 89
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 1 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 0 0
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 1 | Corporate notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 0 0
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 1 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 0 0
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 1 | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 0 0
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 1 | Mortgage-backed and asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 0 0
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 39 173
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | Corporate notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 3,297 4,793
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 12 11
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 1,128 1,263
Balance Sheet Location [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent | Level 2 | Mortgage-backed and asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities: 92 89
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 1,299 2,055
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 25 137
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Corporate notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents:   6
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 81 219
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 9 515
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 1 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 1,299 2,055
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 1 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 1 | Corporate notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents:   0
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 1 | Deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 81 219
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 1 | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 25 137
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | Corporate notes and bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents:   6
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | Deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue | Level 2 | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: $ 9 $ 515