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Financial Instruments - Schedule of Derivative Instruments Designated As Hedging Instruments Table (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in AOCI, Total - pre tax $ 17 $ 0
Reclassifications to net income 0 0
Designated as Hedging Instrument    
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in AOCI, Total - pre tax 17 0
Amount of Gain (Loss) Recognized in AOCI, Less: income taxes 3 0
Amount of Gain (Loss) Recognized in AOCI, Total - Net of Taxes (14) 0
Reclassifications to net income 0 0
Amount of Gain (Loss) Reclassified from AOCI to the Consolidated Statement of Income, Less: income taxes 0 0
Amount of Gain (Loss) Reclassified from AOCI to the Consolidated Statement of Income, Total - Net of Taxes 0 0
Designated as Hedging Instrument | Balance sheet items    
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in AOCI, Total - pre tax 0 0
Reclassifications to net income 0 0
Designated as Hedging Instrument | Forecasted purchases    
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in AOCI, Total - pre tax 17 0
Reclassifications to net income 0 0
Designated as Hedging Instrument | Treasury rate lock contracts    
Derivative [Line Items]    
Amount of Gain (Loss) Recognized in AOCI, Total - pre tax 0 0
Reclassifications to net income $ 0 $ 0