Financial Instruments - Reconciliation of the Change in Level 3 Items (Details) - Level 3 $ in Millions |
9 Months Ended |
---|---|
Oct. 31, 2022
USD ($)
| |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
Balances, January 31, 2022 | $ 0 |
Purchases | 5 |
Balances, October 31, 2022 | 5 |
Derivative Contract | |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
Balances, January 31, 2022 | 0 |
Purchases | 2 |
Balances, October 31, 2022 | 2 |
Convertible Debt Securities | |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
Balances, January 31, 2022 | 0 |
Purchases | 3 |
Balances, October 31, 2022 | $ 3 |