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Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total short-term debt $ 12,998 $ 12,211
Unamortized discount (5) (25)
Unamortized issuance costs (231) (214)
Fair value adjustments 1,055 458
Total long-term debt 110,539 107,390
Total debt $ 123,537 $ 119,601
Average Contractual (interest rate) 2.40% 2.20%
Average Effective (interest rate) 2.50% 2.30%
Short Term Debt Carrying Value Fair Value $ 12,600 $ 10,400
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 6,016 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 2,068 2,708
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 407 1,855
Notes payable within one year 19,263 18,855
Notes payable after one year $ 24,477 $ 29,390
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 1.90% 1.60%
Average Effective (interest rate) 1.90% 1.60%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 12,599 $ 10,254
Notes payable after one year $ 53,381 $ 48,672
Total long-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.50% 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 $ 125,409 $ 120,546