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Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 63 Months Ended | 64 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 02, 2015 | Oct. 08, 2015 | Oct. 01, 2015 | Sep. 24, 2015 | Nov. 04, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Nov. 04, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  | $ 0.10 | $ 0.05 | $ 0.20 | $ 0.10 |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 8.4 |  |  |  | 137.9 |
Stock Repurchased During Period, Value |  |  |  |  |  | $ 101 |  | $ 408 | $ 140 | $ 1,700 |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  | $ 12.44 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  | $ 16 |  | $ 16 |  | $ 16 |
Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Net Sales Proceeds |  |  |  | $ 31 |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.10 |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  | 1.6 |  |  |  |  |  | 139.5
Stock Repurchased During Period, Value |  |  |  |  | $ 16 |  |  |  |  |  | $ 1,700
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  | $ 12.41
Stock repurchase program, additional authorized amount | $ 400 |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | $ 2,100 |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  | $ 400 |  |  |  |  |  | $ 400
Silver Ridge - Italy [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Net Sales Proceeds |  |  | $ 42 |  |  |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: 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 + 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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