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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Total short-term debt $ 11,429 $ 13,717  
Notes payable after one year 86,473 87,310  
Unamortized discount 30 7  
Unamortized debt issuance costs (252) (214)  
Fair value adjustments 1,467 538  
Total long-term debt 126,248 126,312  
Total debt 137,677 140,029  
Debt Carrying Value Fair Value $ 45,500 $ 39,400  
Average Contractual (interest rate) 2.60% 2.90%  
Average Effective (interest rate) 2.60% 3.00%  
Fair value of short-term debt $ 10,400 $ 12,800  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 3,400 4,100 $ 3,500
Discontinued Hedged Debt 299 7  
Fixed Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 71,515 67,090  
Variable Interest Rate [Member]      
Debt Instrument [Line Items]      
Notes payable after one year 14,958 20,220  
Floating Rate Demand Notes [Member]      
Debt Instrument [Line Items]      
Total short-term debt 6,458 6,545  
Unsecured commercial paper [Member]      
Debt Instrument [Line Items]      
Total short-term debt 163 3,560  
Other short-term debt [Member]      
Debt Instrument [Line Items]      
Total short-term debt 3,777 2,731  
Asset-backed Securities [Member]      
Debt Instrument [Line Items]      
Total short-term debt 1,031 881  
Notes payable within one year 21,345 23,609  
Notes payable after one year 32,276 $ 32,162  
Total debt $ 54,652    
Total short-term debt [Member]      
Debt Instrument [Line Items]      
Average Contractual (interest rate) 1.50% 2.80%  
Average Effective (interest rate) 1.60% 2.80%  
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Notes payable within one year $ 17,185 $ 15,062  
Notes payable after one year 54,197 $ 55,148  
Total debt $ 81,780    
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, Measurements, Nonrecurring [Member] | Level 2 [Member]      
Debt Instrument [Line Items]      
Fair value of debt $ 139,796 $ 141,678