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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Total short-term debt $ 14,785 $ 17,225  
Notes payable after one year 89,253 89,738  
Unamortized discount 2 (1)  
Unamortized debt issuance costs (211) (228)  
Fair value adjustments (186) (21)  
Total long-term debt 125,361 120,603  
Total debt 140,146 137,828  
Debt Carrying Value Fair Value $ 38,000 $ 39,000  
Average Contractual (interest rate) 2.80% 2.60%  
Average Effective (interest rate) 2.90% 2.60%  
Fair value of short-term debt $ 13,800 $ 16,400  
Other short-term debt 80 72  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 3,500 2,900 $ 2,400
Fixed Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 61,749 65,569  
Variable Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 27,504 24,169  
Floating Rate Demand Notes [Member]      
Debt Instrument [Line Items]      
Total short-term debt 5,880 5,660  
Unsecured commercial paper [Member]      
Debt Instrument [Line Items]      
Total short-term debt 3,749 4,889  
Other short-term debt [Member]      
Debt Instrument [Line Items]      
Total short-term debt 4,213 5,890  
Asset-backed Securities [Member]      
Debt Instrument [Line Items]      
Total short-term debt 943 786  
Notes payable within one year 22,130 17,817  
Notes payable after one year 36,844 $ 34,051  
Total debt $ 59,917    
Total short-term debt [Member]      
Debt Instrument [Line Items]      
Average Contractual (interest rate) 3.50% 3.00%  
Average Effective (interest rate) 3.50% 3.00%  
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Notes payable within one year $ 14,373 $ 13,298  
Notes payable after one year 52,409 $ 55,687  
Total debt $ 80,624    
Total long-term debt [Member]      
Debt Instrument [Line Items]      
Average Contractual (interest rate) 2.80% 2.50%  
Average Effective (interest rate) 2.80% 2.60%  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]      
Debt Instrument [Line Items]      
Fair value of debt $ 138,888 $ 139,677