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Debt and Financing Activities - Commercial Paper (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2017
Debt Instrument [Line Items] |  |
Commercial paper issuances | $ 0 |
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Credit facility borrowing capacity (up to) |  | $ 3,500,000,000.0
Commercial paper outstanding | $ 0 | $ 183,000,000
Debt, Weighted Average Interest Rate |  | 1.20%

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of the current portion of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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