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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Revenues $ 26,032 $ 28,079 $ 29,706
Cost of goods sold (21,327) (21,832) (22,958)
Other, net (811) (924) (997)
Interest expense (678) (798) (812)
Income taxes 50 271 (417)
Net income (loss) (438) 1,454 $ 1,099
Reclassification out of accumulated other comprehensive income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (172) 35  
Reclassification out of accumulated other comprehensive income | Unrealized Gain (Loss) on Cash Flow Hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Revenues 7 0  
Cost of goods sold (31) 69  
Other, net (6) 16  
Interest expense 5 8  
Income taxes (1) (14)  
Net income (loss) (26) 79  
Reclassification out of accumulated other comprehensive income | Change in Retirement Plans’ Funded Status      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of actuarial losses 47 79  
Amortization of prior service cost (130) (123)  
Reclassification out of accumulated other comprehensive income | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income taxes (63) 0  
Net income (loss) $ (146) $ (44)