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Equity In Net Assets of Nonconsolidated Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Equity income (loss) $ 365 $ (132)  
Net sales and revenue 32,474 32,709  
Net income (loss) 3,014 286  
Equity Method Investee      
Schedule of Equity Method Investments [Line Items]      
Undistributed earnings 1,900   $ 1,600
Automotive China JVs equity income      
Schedule of Equity Method Investments [Line Items]      
Equity income (loss) 308 (167)  
Change in ownership percentage     0.00%
Net sales and revenue 9,875 4,321  
Net income (loss) 586 (348)  
Other joint ventures equity income      
Schedule of Equity Method Investments [Line Items]      
Equity income (loss) $ 57 $ 35