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Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total short-term debt $ 14,626 $ 14,785
Unamortized discount 1 2
Unamortized debt issuance costs (221) (211)
Fair value adjustments 73 (186)
Total long-term debt 128,324 125,361
Total debt $ 142,950 $ 140,146
Average Contractual (interest rate) 3.00% 2.80%
Average Effective (interest rate) 3.10% 2.90%
Debt Carrying Value Fair Value $ 38,100 $ 38,000
Fair value of short-term debt 13,600 13,800
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 6,170 5,880
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 3,713 3,749
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 3,760 4,213
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 983 943
Notes payable within one year 23,502 22,130
Notes payable after one year $ 35,306 $ 36,844
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 3.40% 3.50%
Average Effective (interest rate) 3.40% 3.50%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 13,814 $ 14,373
Notes payable after one year $ 55,849 $ 52,409
Total long-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 3.00% 2.80%
Average Effective (interest rate) 3.00% 2.80%
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 142,595 $ 138,888