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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 8,005 $ (3,882) $ 9,268
Other comprehensive income (loss), net of tax (Note 20)      
Foreign currency translation adjustments and other (715) 747 (384)
Defined benefit plans (221) 570 (969)
Other comprehensive income (loss), net of tax (936) 1,317 (1,353)
Comprehensive income (loss) 7,069 (2,565) 7,915
Comprehensive loss attributable to noncontrolling interests 15 20 218
Comprehensive income (loss) attributable to stockholders $ 7,084 $ (2,545) $ 8,133