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Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Debt Disclosure [Abstract]    
Loss on early extinguishment of debt $ (168) [1] $ 0
Long-term Debt, Excluding Current Maturities 1,500  
Debt Instrument [Line Items]    
Long-term Debt, Excluding Current Maturities 1,500  
Senior Notes due March 2030 [Member]    
Debt Disclosure [Abstract]    
Long-term Debt, Excluding Current Maturities $ 1,000  
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.92%  
Long-term Debt, Excluding Current Maturities $ 1,000  
Senior notes due August 2023 [Member]    
Debt Disclosure [Abstract]    
Long-term Debt, Excluding Current Maturities $ 500  
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
Long-term Debt, Excluding Current Maturities $ 500  
Senior Notes due November 2025 [Member]    
Debt Disclosure [Abstract]    
Long-term Debt, Excluding Current Maturities $ 1,000  
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.80%  
Long-term Debt, Excluding Current Maturities $ 1,000  
[1] During the three months ended March 31, 2020, we recognized a $168 million loss on extinguishment of debt related to the early repurchase of $1.5 billion aggregate principal amount of senior notes. See Note 6 for further discussion on this charge.