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Shareholders' Equity Repurchase Activity (Details) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($) shares
Class of Stock [Line Items]
Stock Repurchased During Period, Shares | shares	4.8
Stock Repurchased During Period, Value	$ 200	$ 200
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 5,500	$ 5,500
Treasury Stock Shares Acquired From Inception | shares	206.0	206.0
Treasury Stock Value Acquired Cost Method From Inception	$ 8,600	$ 8,600

X

- Definition

Number of shares that have been repurchased from inception of the stock repurchase program and are being held in treasury.

+ References

No definition available.

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X

- Definition

Equity impact of the cost of common stock that were repurchased from inception of the stock repurchase program. Recorded using the cost method.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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