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DEBT - Debt Outstanding (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Aug. 31, 2019
Dec. 31, 2018
Nov. 30, 2018
Debt Instrument [Line Items]        
Total short-term debt $ 699,000,000   $ 1,694,000,000  
Long-term debt 5,365,000,000   4,375,000,000  
Commercial paper        
Debt Instrument [Line Items]        
Short-term debt 299,000,000   645,000,000  
Term note        
Debt Instrument [Line Items]        
Face amount       $ 1,000,000,000.0
Short-term debt $ 0   650,000,000  
Senior notes        
Debt Instrument [Line Items]        
Redemption price, percentage 100.00%      
Senior notes | $400 million, 2.625% due October 1, 2019        
Debt Instrument [Line Items]        
Face amount $ 400,000,000      
Stated interest rate (percent) 2.625%      
Long-term debt, current maturities $ 400,000,000   399,000,000  
Senior notes | $400 million, 2.50% due December 15, 2020        
Debt Instrument [Line Items]        
Face amount $ 400,000,000      
Stated interest rate (percent) 2.50%      
Long-term debt $ 399,000,000   398,000,000  
Senior notes | $400 million, 2.90% due December 15, 2022        
Debt Instrument [Line Items]        
Face amount $ 400,000,000      
Stated interest rate (percent) 2.90%      
Long-term debt $ 397,000,000   396,000,000  
Senior notes | $600 million, 3.15% due December 1, 2022        
Debt Instrument [Line Items]        
Face amount $ 600,000,000      
Stated interest rate (percent) 3.15%      
Long-term debt $ 597,000,000   596,000,000  
Senior notes | $600 million, 3.85% due October 1, 2024        
Debt Instrument [Line Items]        
Face amount $ 600,000,000      
Stated interest rate (percent) 3.85%      
Long-term debt $ 597,000,000   597,000,000  
Senior notes | $600 million, 3.95% due March 15, 2027        
Debt Instrument [Line Items]        
Face amount $ 600,000,000      
Stated interest rate (percent) 3.95%      
Long-term debt $ 595,000,000   594,000,000  
Senior notes | $500 million, 3.125% due August 15, 2029        
Debt Instrument [Line Items]        
Face amount $ 500,000,000 $ 500,000,000    
Stated interest rate (percent) 3.125% 3.125%    
Long-term debt $ 495,000,000   0  
Senior notes | $250 million, 8.15% due June 15, 2038        
Debt Instrument [Line Items]        
Face amount $ 250,000,000      
Stated interest rate (percent) 8.15%      
Long-term debt $ 262,000,000   263,000,000  
Senior notes | $400 million, 4.625% due December 1, 2042        
Debt Instrument [Line Items]        
Face amount $ 400,000,000      
Stated interest rate (percent) 4.625%      
Long-term debt $ 396,000,000   396,000,000  
Senior notes | $750 million, 4.95% due October 1, 2044        
Debt Instrument [Line Items]        
Face amount $ 750,000,000      
Stated interest rate (percent) 4.95%      
Long-term debt $ 739,000,000   739,000,000  
Senior notes | $400 million, 4.80% due March 15, 2047        
Debt Instrument [Line Items]        
Face amount $ 400,000,000      
Stated interest rate (percent) 4.80%      
Long-term debt $ 396,000,000   396,000,000  
Senior notes | $500 million, 3.95% due August 15, 2049        
Debt Instrument [Line Items]        
Face amount $ 500,000,000 $ 500,000,000    
Stated interest rate (percent) 3.95% 3.95%    
Long-term debt $ 492,000,000   $ 0