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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Numerator for earnings (loss) per share, basic |  |  |  |
Income (loss) from continuing operations attributable to controlling interest | $ (1,690) | $ 81 | $ (1,599) | $ 317
Undistributed earnings allocable to participating securities |  | (1) |  | (3)
Income (loss) from continuing operations available to shareholders | $ (1,690) | $ 80 | $ (1,599) | $ 314
Denominator for earnings (loss) per share, basic |  |  |  |
Weighted-average shares outstanding | 391.0 | 365.0 | 391.0 | 365.0
Weighted-average shares for per share calculation, basic | 391.0 | 365.0 | 391.0 | 365.0
Per share earnings (loss) from continuing operations, basic | $ (4.32) | $ 0.22 | $ (4.09) | $ 0.86
Numerator for earnings (loss) per share, diluted |  |  |  |
Income (loss) from continuing operations attributable to controlling interest | $ (1,690) | $ 81 | $ (1,599) | $ 317
Undistributed earnings allocable to participating securities |  | (1) |  | (4)
Income (loss) from continuing operations available to shareholders | $ (1,690) | $ 80 | $ (1,599) | $ 313
Denominator for earnings (loss) per share, diluted |  |  |  |
Weighted-average shares outstanding | 391.0 | 365.0 | 391.0 | 365.0
Weighted-average shares for per share calculation, diluted | 391.0 | 365.0 | 391.0 | 365.0
Per share earnings (loss) from continuing operations, diluted | $ (4.32) | $ 0.22 | $ (4.09) | $ 0.86
Share-based awards |  |  |  |
Anti-dilutive securities |  |  |  |
Share-based awards excluded from earnings per share calculation (in shares) | 5.7 | 4.5 | 3.7 | 4.0

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