Fair Value Measurements - Notional Amounts and Fair Values of Interest Rate Swaps (Details) - USD ($) $ in Millions	Jan. 31, 2026	Jan. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	$ 10,791	$ 10,223
Fair Value Hedging \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	4,771	4,771
Cash Flow Hedging \| Cross-currency interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	6,020	5,452
Recurring \| Equity investments measured using Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	(1,331)	(1,999)
Recurring \| Fair Value Hedging \| Interest Rate Swap \| Equity investments measured using Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	(411)	(611)
Recurring \| Cash Flow Hedging \| Cross-currency interest rate swaps \| Equity investments measured using Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ (920)	$ (1,388)