Financing Activities (Details) shares in Millions, $ in Millions |
3 Months Ended |
|---|---|
|
Apr. 30, 2016
USD ($)
shares
| |
| Financing Activities [Abstract] | |
| Stock Repurchased During Period, Shares | shares | 3.0 |
| Stock Repurchased During Period, Value | $ 129 |
| Stock Repurchase Program, Authorized Amount | 1,500 |
| Stock Repurchase Program, Remaining Authorized Repurchase Amount | 1,903 |
| Line of Credit Facility, Current Borrowing Capacity | 1,500 |
| Line of Credit Facility, Maximum Borrowing Capacity | $ 1,750 |
| X | ||||||||||
- Definition Financing Activities [Abstract] No definition available.
|
| X | ||||||||||
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of stock repurchase plan authorized. No definition available.
|
| X | ||||||||||
- Definition Amount remaining of a stock repurchase plan authorized. No definition available.
|
| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|