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Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total short-term debt $ 15,038 $ 17,225
Unamortized discount 0 (1)
Unamortized debt issuance costs (231) (228)
Fair value adjustments (453) (21)
Total long-term debt 121,649 120,603
Total debt $ 136,687 $ 137,828
Average Contractual (interest rate) 2.70% 2.60%
Average Effective (interest rate) 2.80% 2.60%
Debt Carrying Value Fair Value $ 37,500 $ 39,000
Fair value of short-term debt 13,700 16,400
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 5,660 5,660
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 4,453 4,889
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 3,623 5,890
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 1,302 786
Notes payable within one year 19,317 17,817
Notes payable after one year $ 34,625 $ 34,051
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 3.10% 3.00%
Average Effective (interest rate) 3.10% 3.00%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 12,636 $ 13,298
Notes payable after one year $ 55,755 $ 55,687
Total long-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.60% 2.50%
Average Effective (interest rate) 2.70% 2.60%
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 138,669 $ 139,677