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Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($)
$ in Millions
Jun. 24, 2019
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Estimated interest expense related to settled interest rate hedge contracts during the next twelve months   $ 21  
Estimate of gain related to foreign currency exchange contracts during the next 12 months   5  
Settlement of hedge contracts $ 183    
Foreign currency forward exchange contracts | Indian Rupee      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Notional amount of derivatives   220 $ 202
Total fair value of cash flow hedge derivatives   6  
Treasury Lock      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Derivative liability, notional amount   $ 5,000