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Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total short-term debt $ 12,826 $ 12,211
Unamortized discount (15) (25)
Unamortized issuance costs (243) (214)
Fair value adjustments 1,294 458
Total long-term debt 113,523 107,390
Total debt $ 126,349 $ 119,601
Average Contractual (interest rate) 2.30% 2.20%
Average Effective (interest rate) 2.40% 2.30%
Short Term Debt Carrying Value Fair Value $ 12,200 $ 10,400
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 6,051 5,926
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 3,472 1,722
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 2,634 2,708
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 669 1,855
Notes payable within one year 19,349 18,855
Notes payable after one year $ 27,420 $ 29,390
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 1.70% 1.60%
Average Effective (interest rate) 1.70% 1.60%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 10,395 $ 10,254
Notes payable after one year $ 55,323 $ 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%
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 128,262 $ 120,546