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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |
Income tax expense related to continuing operations | $ 95 | $ 239
Net discrete tax expense (benefit) | $ 3 | (35)
Tax benefit recognized related to excess tax benefits arising from adoption of ASU 2016-09 |  | $ 37
Income tax rate (as a percent) | 20.70% | 26.20%
Unrecognized tax benefits | $ 516 |
Unrecognized tax benefits that would reduce income tax expense and the effective tax rate | 371 |
Decrease in unrecognized tax benefits that could result from audit resolutions | $ 60 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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