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Legal Matters - Additional Information (Detail) (USD $) | 6 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Jan. 27, 2014 Class plaintiffs | Mar. 31, 2014 Class plaintiffs | Mar. 31, 2013 Class plaintiffs | Sep. 30, 2013 Class plaintiffs | Dec. 16, 2013 Interchage Litigation
Loss Contingencies [Line Items] |  |  |  |  |  |
Payments on litigation matters |  |  | $ 0 | $ 4,033,000,000 | $ 4,033,000,000 |
Adjustment to payments for litigation |  | 1,056,000,000 |  |  |  |
Damages sought by plaintiff from all defendant parties |  |  |  |  |  | 54,000,000,000
Estimated compensatory damages | $ 1,000,000,000 |  |  |  |  |

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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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