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Shareholders' Equity And Net Income Per Share Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share Repurchase Program [Line Items]
Stock Repurchased During Period, in shares		793,424	1,018,930	2,513,136	4,667,193
Stock Repurchased, Average Price per Share		$ 86.08	$ 92.99	$ 88.24	$ 82.00
Stock Repurchased During Period, Value		$ 69	$ 95	$ 222	$ 383
Share Repurchase Program April 2016
Share Repurchase Program [Line Items]
Stock Repurchase Program, Authorized Amount		1,500		1,500
Stock Repurchase Program, Remaining Authorized Repurchase Amount		767		767
Share Repurchase Program January 2015
Share Repurchase Program [Line Items]
Stock Repurchase Program, Authorized Amount		$ 1,500		$ 1,500
Subsequent Event
Share Repurchase Program [Line Items]
Stock Repurchased During Period, Value	$ 42
Subsequent Event | Share Repurchase Program April 2016
Share Repurchase Program [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 725

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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