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Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total short-term debt $ 16,665 $ 17,225
Unamortized discount 1 (1)
Unamortized debt issuance costs (236) (228)
Fair value adjustments (360) (21)
Total long-term debt 125,309 120,603
Total debt $ 141,974 $ 137,828
Average Contractual (interest rate) 2.60% 2.60%
Average Effective (interest rate) 2.70% 2.60%
Fair value of short-term debt $ 15,500 $ 16,400
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 5,735 5,660
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 4,758 4,889
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 5,034 5,890
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 1,138 786
Notes payable within one year 18,461 17,817
Notes payable after one year $ 36,744 $ 34,051
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.90% 3.00%
Average Effective (interest rate) 2.90% 3.00%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 14,195 $ 13,298
Notes payable after one year $ 56,504 $ 55,687
Total long-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.60% 2.50%
Average Effective (interest rate) 2.60% 2.60%
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 142,952 $ 139,677