Common shares repurchased.

No definition available.

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- Definition

Percentage increase in quarterly dividend.

+ References

No definition available.

+ Details

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- Definition

Stock repurchase program additional authorized amount.

+ References

No definition available.

+ Details

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Period Type:	duration

- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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Period Type:	duration

- Details

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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018
Stockholders Equity [Abstract]
Common shares repurchased value	$ 428				$ 499
Percentage of increase to quarterly dividend	33.00%				33.00%
Common stock dividends, rate per share	$ 0.08	$ 0.06	$ 0.06	$ 0.06
Share Repurchase Program [Member]
Stockholders Equity [Abstract]
Share-repurchase program, additional authorized amount	$ 3,000				$ 3,000
Share-repurchase program expiration date					Dec. 31, 2019
Common shares repurchased					13.7
Common shares repurchased value					$ 521
Common shares repurchased, rate per share					$ 38.01
Share Repurchase Program [Member] \| Maximum [Member]
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount	$ 4,000	$ 1,000			$ 4,000