|**Other Assets (Tables)**                           | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                        
|--------------------------------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Other Assets [Abstract]**                         |                                                                                                                                                                                                                                                                                                                                                                                                                        
|Schedule of Other assets                            | The components of Other assets as of December 31, were as follows:(Millions of dollars)20222021Customer and other miscellaneous receivables$419$400Collateral held for resale, at net realizable value102168Deferred and refundable income taxes148126Property and equipment, net132133Other(1)454261Total Other assets$1,255$1,088(1)Includes Derivative financial instruments. See Note 8 for additional information.
|                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                        
|(Millions of dollars)                               |                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                        
|Customer and other miscellaneous receivables        |                                                                                                                                                                                                                                                                                                                                                                                                                        
|Collateral held for resale, at net realizable value |                                                                                                                                                                                                                                                                                                                                                                                                                        
|Deferred and refundable income taxes                |                                                                                                                                                                                                                                                                                                                                                                                                                        
|Property and equipment, net                         |                                                                                                                                                                                                                                                                                                                                                                                                                        
|Other(1)                                            |                                                                                                                                                                                                                                                                                                                                                                                                                        
|Total Other assets                                  |                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                        

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