v3.3.1.900

Capital Structure (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |
Common Stock, authorized shares (in shares) | 1,400,000,000 | 1,400,000,000 |  |
Common Stock, issued shares (in shares) | 356,755,747 | 502,287,022 |  |
Common Stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |  |
Common Stock, outstanding shares (in shares) | 356,662,004 | 381,921,264 | 429,038,988 | 457,048,970
Shares issued under Calpine Equity Incentive Plans | 1,341,908 | 2,566,799 | 3,022,128 |
Share repurchase program | (26,601,168) | (49,684,523) | (31,032,110) |
Treasury Stock, Shares, Retired | 0 |  |  |
Treasury Stock, Shares (in shares) | 93,743 | 120,365,758 |  |
Treasury Stock, Value | $ 1 | $ 2,345 |  |
Payments for Repurchase of Common Stock | $ 529 | $ 1,100 | $ 623 |
Treasury Stock Acquired, Average Cost Per Share | $ 19.87 |  |  |
Shares Issued [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock, issued shares (in shares) | 356,755,747 | 502,287,022 | 497,841,056 | 492,495,100
Shares issued under Calpine Equity Incentive Plans | 2,431,236 | 4,445,966 | 5,345,956 |
Share repurchase program | 0 | 0 | 0 |
Treasury Stock, Shares, Retired | 147,962,511 |  |  |
Treasury Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares issued under Calpine Equity Incentive Plans | (1,089,328) | (1,879,167) | (2,323,828) |
Share repurchase program | (26,601,168) | (49,684,523) | (31,032,110) |
Treasury Stock, Shares, Retired | 147,962,511 |  |  |
Treasury Stock, Shares (in shares) | 93,743 | 120,365,758 | 68,802,068 | 35,446,130

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