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Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total short-term debt $ 11,960 $ 12,211
Unamortized discount (22) (25)
Unamortized issuance costs (238) (214)
Fair value adjustments 1,046 458
Total long-term debt 115,474 107,390
Total debt 127,434 119,601
Fair value of debt $ 128,701 $ 120,546
Average Contractual (interest rate) 2.30% 2.20%
Average Effective (interest rate) 2.40% 2.30%
Short Term Debt Carrying Value Fair Value $ 10,900 $ 10,400
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 5,992 5,926
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 1,960 1,722
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 2,944 2,708
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 1,064 1,855
Notes payable within one year 20,231 18,855
Notes payable after one year $ 28,638 $ 29,390
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 1.80% 1.60%
Average Effective (interest rate) 1.80% 1.60%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 13,668 $ 10,254
Notes payable after one year $ 52,151 $ 48,672
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%