Fair Value Measurements - Notional Amounts and Fair Values of Interest Rate Swaps (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jan. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	$ 10,223	$ 12,150
Fair Value Hedging | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	4,771	6,271
Cash Flow Hedging | Cross-currency interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount	5,452	5,879
Recurring | Equity investments measured using Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	(1,999)	(1,956)
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	(611)	(654)
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	$ (1,388)	$ (1,302)