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Debt - Long-Term Debt (Details) - USD ($)
$ in Millions
Oct. 03, 2019
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Outstanding debt   $ 5,500  
Long-term debt due within one year   600 $ 0
Long-term debt   $ 4,903 $ 5,499
Senior Unsecured Note Due 2022      
Debt Instrument [Line Items]      
Interest rate   2.80%  
Long-term debt   $ 1,000  
Subsequent Event      
Debt Instrument [Line Items]      
Repayments of Debt $ 600    
Subsequent Event | Senior Unsecured Notes Due 2020      
Debt Instrument [Line Items]      
Interest rate 2.70%