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Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Residual value guarantees $ 220   $ 220
Accounts payable outsourcing $ 1,100   $ 1,200
Percentage of LIFO inventory (41.00%)   (41.00%)
Inventories $ 2,470   $ 2,301
Deferred income taxes (2,053)   (2,189)
Retained earnings 9,079   8,725
Impact on cash used in operating activities 182 $ (814)  
Effect of Change      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Inventories 117   114
Deferred income taxes 29   28
Retained earnings 88   $ 86
Impact on cash used in operating activities $ 0 $ 0