Fair Value Measurements - Notional Amounts and Fair Values of Interest Rate Swaps (Details) - USD ($) $ in Millions	Jan. 31, 2024	Jan. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	$ 12,150	$ 13,921
Fair Value Hedging | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	6,271	8,021
Cash Flow Hedging | Cross-currency interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	5,879	5,900
Recurring | Equity investments measured using Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	(1,956)	(2,112)
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	(654)	(689)
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	$ (1,302)	$ (1,423)