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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total short-term debt $ 17,225 $ 15,359  
Notes payable after one year 89,738 79,420  
Unamortized discount (1) (8)  
Unamortized debt issuance costs (228) (212)  
Fair value adjustments (21) 278  
Total long-term debt 120,603 111,133  
Total debt $ 137,828 $ 126,492  
Average Contractual (interest rate) 2.60% 2.40%  
Average Effective (interest rate) 2.60% 2.40%  
Accrued interest included in fair value of debt $ 717 $ 658  
Fair value of short-term debt 16,400 14,300  
Other short-term debt 72 29  
Interest Paid 2,900 2,400 $ 2,200
Fixed Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 65,569 56,684  
Variable Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 24,169 22,736  
Floating Rate Demand Notes [Member]      
Debt Instrument [Line Items]      
Total short-term debt 5,660 5,986  
Unsecured commercial paper [Member]      
Debt Instrument [Line Items]      
Total short-term debt 4,889 4,507  
Other short-term debt [Member]      
Debt Instrument [Line Items]      
Total short-term debt 5,890 3,803  
Asset-backed Securities [Member]      
Debt Instrument [Line Items]      
Total short-term debt 786 1,063  
Notes payable within one year 17,817 19,286  
Notes payable after one year 34,051 $ 30,112  
Total debt $ 52,654    
Total short-term debt [Member]      
Debt Instrument [Line Items]      
Average Contractual (interest rate) 3.00% 2.30%  
Average Effective (interest rate) 3.00% 2.30%  
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Notes payable within one year $ 13,298 $ 12,369  
Notes payable after one year 55,687 $ 49,308  
Total debt $ 85,424    
Total long-term debt [Member]      
Debt Instrument [Line Items]      
Average Contractual (interest rate) 2.50% 2.40%  
Average Effective (interest rate) 2.60% 2.50%  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]      
Debt Instrument [Line Items]      
Fair value of debt $ 139,677 $ 128,001  
Affiliated Entity [Member]      
Debt Instrument [Line Items]      
Interest Expense, Related Party $ 3 $ 4 $ 19