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Stockholders' Equity (Shares Repurchases) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended |  |  |  |
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Apr. 30, 2015 | Jan. 31, 2013 | Apr. 30, 2012 | Mar. 31, 2012
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate dollar value of shares that may yet to be purchased under the programs | $ 0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | [1] | $ 340us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | [1] | $ 340us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | [1] |  |  |  |  |  | $ 299us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | [1]
Stock repurchase plans approved, shares |  |  |  |  |  |  | 500us-gaap_StockRepurchaseProgramAuthorizedAmount1 | 500us-gaap_StockRepurchaseProgramAuthorizedAmount1 | [1] | 700us-gaap_StockRepurchaseProgramAuthorizedAmount1 | [1] |  |
Repurchase of common stock | $ (340)us-gaap_TreasuryStockValueAcquiredCostMethod | [1] | $ 0us-gaap_TreasuryStockValueAcquiredCostMethod |  | $ (1,159)us-gaap_TreasuryStockValueAcquiredCostMethod | [1] |  |  |  |  |  |  |
Number of shares repurchased | 1.5us-gaap_TreasuryStockSharesAcquired | [1],[2],[3] | 0us-gaap_TreasuryStockSharesAcquired |  | 13.0us-gaap_TreasuryStockSharesAcquired | [1],[2],[3] |  |  |  |  |  |  |
Average price paid per share | $ 226.55us-gaap_TreasuryStockAcquiredAverageCostPerShare | [1] | $ 0.00us-gaap_TreasuryStockAcquiredAverageCostPerShare |  | $ 100.82us-gaap_TreasuryStockAcquiredAverageCostPerShare | [1] |  |  |  |  |  |  |
[1] | This table does not include shares tendered to satisfy the exercise price in connection with cashless exercises of employee stock options or shares tendered to satisfy tax withholding obligations in connection with employee equity awards.
[2] | All of the shares purchased were part of the publicly announced programs.
[3] | The number of shares purchased reflects rounding adjustments.

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- Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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