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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 6,667 $ 8,005 $ (3,882)
Other comprehensive income (loss), net of tax (Note 20)      
Foreign currency translation adjustments and other (6) (715) 747
Defined benefit plans (2,122) (221) 570
Other comprehensive income (loss), net of tax (2,128) (936) 1,317
Comprehensive income (loss) 4,539 7,069 (2,565)
Comprehensive loss attributable to noncontrolling interests 76 15 20
Comprehensive income (loss) attributable to stockholders $ 4,615 $ 7,084 $ (2,545)