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Correction of Errors in Previously Reported Consolidated Financial Statements (CompInc) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Correction of Previously Reported Financial Statements |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 257 | $ 236 | $ 93 | $ 241 | $ 622 | $ 395 | $ 341 | $ (461) | $ 827 | $ 897 | $ (1,900)
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 49 | 32 | (61)
Net income (loss) attributable to controlling interest | $ 243 | 218 | 82 | 235 | 616 | 386 | 335 | (472) | 778 | 865 | (1,839)
Components of net periodic benefit costs before reclassifications |  |  |  |  |  |  |  |  | (20) | 63 | (170)
Components of net periodic benefit costs reclassified to net income |  |  |  |  |  |  |  |  | 8 | 23 | 17
Gain on derivative instruments reclassified to net income |  |  |  |  |  |  |  |  |  |  | (2)
Other comprehensive income (loss) before income taxes |  |  |  |  |  |  |  |  | (12) | 86 | (155)
Income taxes related to other comprehensive income |  |  |  |  |  |  |  |  | 6 | (17) | 35
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (6) | 69 | (120)
Other comprehensive income attributable to controlling interest |  |  |  |  |  |  |  |  | (6) | 69 | (120)
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | 821 | 966 | (2,020)
Total comprehensive income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 49 | 32 | (61)
Total comprehensive income attributable to controlling interest |  |  |  |  |  |  |  |  | $ 772 | 934 | (1,959)
Previously reported |  |  |  |  |  |  |  |  |  |  |
Correction of Previously Reported Financial Statements |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 244 | 88 | 255 | 617 | 330 | 348 | (469) |  | 826 | (1,966)
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | 35 | (53)
Net income (loss) attributable to controlling interest |  | 229 | 77 | 249 | 611 | 321 | 342 | (483) |  | 791 | (1,913)
Components of net periodic benefit costs before reclassifications |  |  |  |  |  |  |  |  |  | 63 | (170)
Components of net periodic benefit costs reclassified to net income |  |  |  |  |  |  |  |  |  | 23 | 17
Gain on derivative instruments reclassified to net income |  |  |  |  |  |  |  |  |  |  | (2)
Other comprehensive income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 86 | (155)
Income taxes related to other comprehensive income |  |  |  |  |  |  |  |  |  | (16) | 13
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 70 | (142)
Other comprehensive income attributable to controlling interest |  |  |  |  |  |  |  |  |  | 70 | (142)
Total comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 896 | (2,108)
Total comprehensive income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | 35 | (53)
Total comprehensive income attributable to controlling interest |  |  |  |  |  |  |  |  |  | 861 | (2,055)
Adjusted |  |  |  |  |  |  |  |  |  |  |
Correction of Previously Reported Financial Statements |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (8) | 5 | (14) | 5 | 65 | (7) | 8 |  | 71 | 66
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | (3) | (8)
Net income (loss) attributable to controlling interest |  | $ (11) | $ 5 | $ (14) | $ 5 | $ 65 | $ (7) | $ 11 |  | 74 | 74
Income taxes related to other comprehensive income |  |  |  |  |  |  |  |  |  | (1) | 22
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | (1) | 22
Other comprehensive income attributable to controlling interest |  |  |  |  |  |  |  |  |  | (1) | 22
Total comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 70 | 88
Total comprehensive income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | (3) | (8)
Total comprehensive income attributable to controlling interest |  |  |  |  |  |  |  |  |  | $ 73 | $ 96

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