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Retrospective Responsibility Plan Changes in the Escrow Account (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 27, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2013
Escrow Account [Roll Forward] |  |  |  |
Litigation Escrow Account Balance, Beginning of Period |  | $ 49 | $ 4,432 | $ 4,432
Return of takedown payments to the litigation escrow account |  | 1,056 | 0 |
Litigation Escrow Account Balance, End of Period |  | 1,105 | 49 |
Class plaintiffs |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Adjustment to payments for litigation | 1,056 |  |  |
Escrow Account [Roll Forward] |  |  |  |
Payments to Settlement Funds |  | 0 | (4,033) | (4,033)
Individual Plaintiffs |  |  |  |
Escrow Account [Roll Forward] |  |  |  |
Payments to Settlement Funds |  | $ 0 | $ (350) |

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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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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Adjustment to Payments for Legal Settlement + References No definition available. + Details
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- Details
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- Definition Return to Litigation Escrow Account-Retrospective Responsibility Plan + References No definition available. + Details
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