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Debt and Credit Agreements - Activity Related to Long-Term Debt (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 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 $ 1,000
Long-term debt repaid (227) $ 0
Reclassifications 0  
Discount, premium and other activity (5)  
Long-term debt as of June 30, 2020, Current Portion 378  
Long-term debt as of June 30, 2020, Long-term Portion 16,128  
Long-term debt as of June 30, 2020, Total 16,506  
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 (227)  
Reclassifications 360  
Discount, premium and other activity 0  
Long-term debt as of June 30, 2020, Current Portion 378  
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 (360)  
Discount, premium and other activity (5)  
Long-term debt as of June 30, 2020, Long-term Portion $ 16,128  
[1] Certain prior year data has been reclassified to conform to the current presentation.