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Debt and Credit Agreements - Activity Related to Long-Term Debt (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
[1]
Movement, Debt Instruments [Roll Forward]    
Long-term debt as of December 31, 2019, Current Portion $ 245  
Long-term debt as of December 31, 2019, Long-term Portion 15,993  
Long-term debt as of December 31, 2019, Total 16,238  
Long-term debt issued 500 $ 2,000
Long-term debt repaid (245) $ (18)
Reclassifications 0  
Discount, premium and other activity (1)  
Long-term debt as of September 30, 2020, Current Portion 371  
Long-term debt as of September 30, 2020, Long-term Portion 16,121  
Long-term debt as of September 30, 2020, Total 16,492  
Current Portion    
Movement, Debt Instruments [Roll Forward]    
Long-term debt as of December 31, 2019, Current Portion 245  
Long-term debt issued 0  
Long-term debt repaid (245)  
Reclassifications 371  
Discount, premium and other activity 0  
Long-term debt as of September 30, 2020, Current Portion 371  
Long-term Portion    
Movement, Debt Instruments [Roll Forward]    
Long-term debt as of December 31, 2019, Long-term Portion 15,993  
Long-term debt issued 500  
Long-term debt repaid 0  
Reclassifications (371)  
Discount, premium and other activity (1)  
Long-term debt as of September 30, 2020, Long-term Portion $ 16,121  
[1] Certain prior year data has been reclassified to conform to the current presentation.