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Shareholders' Equity And Net Income Per Share Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Repurchase Program [Line Items]
Stock Repurchased During Period, Shares	6,530,369	4,667,193	9,481,946
Stock Repurchased, Average Price	$ 76.44	$ 82.00	$ 66.93
Stock Repurchased During Period, Value	$ 499	$ 383	$ 635
Share Repurchase Program April 2016
Share Repurchase Program [Line Items]
Stock Repurchase Program, Authorized Amount	1,500
Stock Repurchase Program, Remaining Authorized Repurchase Amount	490
Share Repurchase Program January 2015
Share Repurchase Program [Line Items]
Stock Repurchase Program, Authorized Amount	1,500
Share Repurchase Program January 2019 [Member]
Share Repurchase Program [Line Items]
Stock Repurchase Program, Authorized Amount	$ 2,000

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