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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Total short-term debt $ 13,717 $ 14,785  
Notes payable after one year 87,310 89,253  
Unamortized discount 7 2  
Unamortized debt issuance costs (214) (211)  
Fair value adjustments 538 (186)  
Total long-term debt 126,312 125,361  
Total debt 140,029 140,146  
Debt Carrying Value Fair Value $ 39,400 $ 38,000  
Average Contractual (interest rate) 2.90% 2.80%  
Average Effective (interest rate) 3.00% 2.90%  
Fair value of short-term debt $ 12,800 $ 13,800  
Other short-term debt 0 80  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 4,100 3,500 $ 2,900
Fixed Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 67,090 61,749  
Variable Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 20,220 27,504  
Floating Rate Demand Notes [Member]      
Debt Instrument [Line Items]      
Total short-term debt 6,545 5,880  
Unsecured commercial paper [Member]      
Debt Instrument [Line Items]      
Total short-term debt 3,560 3,749  
Other short-term debt [Member]      
Debt Instrument [Line Items]      
Total short-term debt 2,731 4,213  
Asset-backed Securities [Member]      
Debt Instrument [Line Items]      
Total short-term debt 881 943  
Notes payable within one year 23,609 22,130  
Notes payable after one year 32,162 $ 36,844  
Total debt $ 56,652    
Total short-term debt [Member]      
Debt Instrument [Line Items]      
Average Contractual (interest rate) 2.80% 3.50%  
Average Effective (interest rate) 2.80% 3.50%  
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Notes payable within one year $ 15,062 $ 14,373  
Notes payable after one year 55,148 $ 52,409  
Total debt $ 83,046    
Total long-term debt [Member]      
Debt Instrument [Line Items]      
Average Contractual (interest rate) 3.00% 2.80%  
Average Effective (interest rate) 3.00% 2.80%  
Fair Value, Nonrecurring [Member] | Level 2 [Member]      
Debt Instrument [Line Items]      
Fair value of debt $ 141,678 $ 138,888