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Summary of Significant Accounting Policies - Changes in accounting policies (Details) $ in Millions | 12 Months Ended
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Jan. 31, 2015 USD ($)
Other Current Assets [Member] | As reported [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 703
Other Current Assets [Member] | Accounting Standards Update 2015-03 and 2015-15 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (2)
Other Current Assets [Member] | Accounting Standards Update 2015-17 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (252)
Other Current Assets [Member] | Adjusted Balance [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 449
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | As reported [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 684
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Accounting Standards Update 2015-03 and 2015-15 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Accounting Standards Update 2015-17 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (3)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Adjusted Balance [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 681
Other Assets [Member] | As reported [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 583
Other Assets [Member] | Accounting Standards Update 2015-03 and 2015-15 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (6)
Other Assets [Member] | Accounting Standards Update 2015-17 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 252
Other Assets [Member] | Adjusted Balance [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 829
Assets, Total [Member] | As reported [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 15,256
Assets, Total [Member] | Accounting Standards Update 2015-03 and 2015-15 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (8)
Assets, Total [Member] | Accounting Standards Update 2015-17 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (3)
Assets, Total [Member] | Adjusted Balance [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 15,245
Long-term Debt [Member] | As reported [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 1,580
Long-term Debt [Member] | Accounting Standards Update 2015-03 and 2015-15 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (8)
Long-term Debt [Member] | Accounting Standards Update 2015-17 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 0
Long-term Debt [Member] | Adjusted Balance [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 1,572
Long-Term Liabilities Held-for-Sale [Member] | As reported [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 18
Long-Term Liabilities Held-for-Sale [Member] | Accounting Standards Update 2015-03 and 2015-15 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 0
Long-Term Liabilities Held-for-Sale [Member] | Accounting Standards Update 2015-17 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (3)
Long-Term Liabilities Held-for-Sale [Member] | Adjusted Balance [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 15
Liabilities, Total [Member] | As reported [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 15,256
Liabilities, Total [Member] | Accounting Standards Update 2015-03 and 2015-15 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (8)
Liabilities, Total [Member] | Accounting Standards Update 2015-17 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (3)
Liabilities, Total [Member] | Adjusted Balance [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 15,245

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