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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net loss | $ (4,025) | $ (12,089) | $ (745)
Defined benefit plans: |  |  |
Actuarial losses arising during the period | (88) | (5) | (166)
Amortization of unrecognized amounts included in net periodic benefit costs | 44 | 38 | 25
Foreign exchange (losses) gains | (1) | 8 | 1
Unrealized gains (losses) on securities | 2 | 0 | (1)
Other comprehensive (loss) income | (43) | 41 | (141)
Total comprehensive loss | (4,068) | (12,048) | (886)
Total comprehensive income attributable to noncontrolling interests | (292) | (106) | (521)
Gain on redemption and preferred dividends attributable to noncontrolling interests | 161 | (41) | (40)
Total comprehensive loss attributable to common stockholders | $ (4,199) | $ (12,195) | $ (1,447)

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