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Income Taxes (Tables) | 6 Months Ended
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Oct. 28, 2016
Income Tax Disclosure [Abstract] |
Effective Tax Rates | Our effective tax rates for the periods presented were as follows:
|  | Six Months Ended |
|  | October 28, 2016 |  |  | October 30, 2015 |
Effective tax rates |  |  | 26.1 | % |  |  | 31.1 | %
Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
|  | Six Months Ended |
|  | October 28, 2016 |  |  | October 30, 2015 |
Balance at beginning of period |  | $ | 216 |  |  | $ | 272 |
Additions based on tax positions related to the current year |  |  | 3 |  |  |  | 7 |
Additions for tax positions of prior years |  |  | 5 |  |  |  | 20 |
Decreases for tax positions of prior years |  |  | — |  |  |  | (38 | )
Settlements |  |  | (12 | ) |  |  | (52 | )
Balance at end of period |  | $ | 212 |  |  | $ | 209 |

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=75116239&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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