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Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total short-term debt $ 12,424 $ 13,717
Unamortized discount 6 7
Unamortized debt issuance costs (207) (214)
Fair value adjustments 1,629 538
Total long-term debt 124,412 126,312
Total debt $ 136,836 $ 140,029
Average Contractual (interest rate) 2.90% 2.90%
Average Effective (interest rate) 2.90% 3.00%
Debt Carrying Value Fair Value $ 41,600 $ 39,400
Fair value of short-term debt 11,300 12,800
Floating Rate Demand Notes [Member]    
Debt Instrument [Line Items]    
Total short-term debt 5,709 6,545
Unsecured commercial paper [Member]    
Debt Instrument [Line Items]    
Total short-term debt 2,867 3,560
Other short-term debt [Member]    
Debt Instrument [Line Items]    
Total short-term debt 2,754 2,731
Asset-backed Securities [Member]    
Debt Instrument [Line Items]    
Total short-term debt 1,094 881
Notes payable within one year 21,736 23,609
Notes payable after one year $ 32,973 $ 32,162
Total short-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.50% 2.80%
Average Effective (interest rate) 2.50% 2.80%
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Notes payable within one year $ 17,137 $ 15,062
Notes payable after one year $ 51,138 $ 55,148
Total long-term debt [Member]    
Debt Instrument [Line Items]    
Average Contractual (interest rate) 2.90% 3.00%
Average Effective (interest rate) 2.90% 3.00%
Fair Value, Nonrecurring [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 128,714 $ 141,678