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Stock-Based Compensation Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based Compensation Expense $ 19 $ 16 $ 67 $ 53
Income tax benefits related to stock based compensation expense $ 4 $ 3 $ 14 $ 10
OIP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 20,000,000   20,000,000