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Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016 | Oct. 09, 2017 | Jun. 05, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ 626 | $ 596 | $ 448 |  |
Income tax benefit recognized for share-based compensation | 150 | 212 | 151 |  |
Number of shares registered under the Securities Act of 1933 |  |  |  |  | 210,000
Restricted stock and performance share units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ 234 | $ 237 | $ 134 |  |
Shares, granted | 3,598 |  |  |  |
Restricted stock and performance share units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock and performance share awards vesting percentages | 0.00% |  |  |  |
Restricted stock, performance share awards and stock option plans vesting periods, in years | 1 year |  |  |  |
Restricted stock and performance share units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock and performance share awards vesting percentages | 150.00% |  |  |  |
Restricted stock, performance share awards and stock option plans vesting periods, in years | 3 years |  |  |  |
Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average discount for dividend yield | 7.20% | 8.30% | 7.40% |  |
Restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ 368 | $ 332 | $ 292 |  |
Weighted average discount for dividend yield | 9.00% | 9.00% | 8.70% |  |
Restricted stock units vesting percentage, 3 years | 50.00% |  |  |  |
Restricted stock units vesting percentage, 5 years | 50.00% |  |  |  |
Shares, granted | 8,570 |  |  |  |
Restricted stock units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock, performance share awards and stock option plans vesting periods, in years | 3 years |  |  |  |
Restricted stock units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock, performance share awards and stock option plans vesting periods, in years | 5 years |  |  |  |
Employee Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock, performance share awards and stock option plans vesting periods, in years | 3 years |  |  |  |
Two Thousand And Seventeen Share Repurchase Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share repurchase program, authorized amount |  |  |  | $ 20,000 |
Stock repurchase program, remaining authorized repurchase amount | $ 18,800 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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