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Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Jan. 09, 2020
Dec. 31, 2018
Debt Instrument      
Medium-term notes, maximum remaining maturity 8 years    
Long-term debt $ 23,334   $ 22,815
Long-term debt outstanding maturity:      
2020 6,194    
2021 7,732    
2022 4,744    
2023 2,167    
2024 2,157    
Thereafter 340    
Total 23,334   22,815
Medium-term notes, callable 29    
Medium-term notes excluded from current maturities of long-term debt due to subsequent debt issuance 1,500    
Medium-term notes      
Debt Instrument      
Long-term debt issued 6,090    
Long-term debt issued at fixed interest rates 3,590    
Long-term debt issued at floating interest rates 2,500    
Long term debt, gross 22,739   22,226
Unamortized discount and debt issuance costs (47)   (57)
Long-term debt $ 22,692   $ 22,169
Long-term debt, Avg. Rate 2.60%   2.60%
Long-term debt outstanding maturity:      
Total $ 22,692   $ 22,169
Medium-term notes | Subsequent Event | 2021      
Debt Instrument      
Long term debt, gross   $ 750  
Medium-term notes | Subsequent Event | 2022      
Debt Instrument      
Long term debt, gross   $ 750  
Bank borrowings      
Debt Instrument      
Long-term debt $ 642   $ 646
Long-term debt, Avg. Rate 6.60%   5.80%
Long-term debt outstanding maturity:      
Total $ 642   $ 646