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Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total short-term debt $ 15,359 $ 12,211
Notes payable after one year 79,420 78,062
Unamortized discount (8) (25)
Unamortized debt issuance costs (212) (214)
Fair value adjustments 278 458
Total long-term debt 111,133 107,390
Total debt $ 126,492 $ 119,601
Average Contractual (interest rate) 2.40% 2.20%
Average Effective (interest rate) 2.40% 2.30%
Accrued interest included in fair value of debt $ 658 $ 550
Fair value of short-term debt 14,300 10,400
Fixed Interest Rate [Member]    
Debt Instrument [Line Items]    
Notes payable after one year 56,684 54,396
Variable Interest Rate [Member]    
Debt Instrument [Line Items]    
Notes payable after one year 22,736 23,666
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 5,986 5,926
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 4,507 1,722
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 3,803 2,708
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 1,063 1,855
Notes payable within one year 19,286 18,855
Notes payable after one year 30,112 $ 29,390
Total debt $ 50,461  
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.30% 1.60%
Average Effective (interest rate) 2.30% 1.60%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 12,369 $ 10,254
Notes payable after one year 49,308 $ 48,672
Total debt $ 75,973  
Total long-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.40% 2.30%
Average Effective (interest rate) 2.50% 2.40%
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 128,001 $ 120,546