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Repurchase of Common Stock Authorized Common Stock Repurchases (Details) - USD ($) $ in Billions | Jul. 29, 2017 | Feb. 27, 2017 | Jun. 30, 2011
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February 2017 share repurchase program [Member] |  |  |
Authorized Share Repurchases [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 5.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 4.3 |  |
June 2011 share repurchase program [Member} |  |  |
Authorized Share Repurchases [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 5.0

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- Definition [Line Items] for Authorized Share Repurchases [Table] + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |