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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Income tax expense related to continuing operations | $ 239 | $ 256
Net discrete tax benefits | $ 35 | $ 5
Income tax rate (as a percent) | 26.20% | 29.90%
Unrecognized tax benefits | $ 414 |
Unrecognized tax benefits that would reduce income tax expense and the effective tax rate | 274 |
Income tax (benefit) expense | (3) | $ 6
Accrued interest and penalties on unrecognized tax benefits | 49 | $ 75
Effect of Early Adoption of ASU 2016-09 [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount | $ 37 |

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- Definition Percentage 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 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 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)(2)) -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 -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + 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 (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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