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Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total short-term debt $ 11,681 $ 13,717
Unamortized discount 5 7
Unamortized debt issuance costs (205) (214)
Fair value adjustments 1,717 538
Total long-term debt 123,586 126,312
Total debt $ 135,267 $ 140,029
Average Contractual (interest rate) 2.70% 2.90%
Average Effective (interest rate) 2.70% 3.00%
Debt Carrying Value Fair Value $ 42,500 $ 39,400
Fair value of short-term debt 10,900 12,800
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 5,910 6,545
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 1,793 3,560
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 3,186 2,731
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 792 881
Notes payable within one year 22,997 23,609
Notes payable after one year $ 30,794 $ 32,162
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.00% 2.80%
Average Effective (interest rate) 2.00% 2.80%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 18,567 $ 15,062
Notes payable after one year $ 49,711 $ 55,148
Total long-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.70% 3.00%
Average Effective (interest rate) 2.70% 3.00%
Fair Value, Nonrecurring [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 132,836 $ 141,678