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Consolidated Statements of Equity - Shares of Treasury Stock - shares shares in Millions	Total	Treasury Stock
Beginning balance at Dec. 31, 2017		(248)
Number of shares repurchased		(19)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2018		(267)
Beginning balance at Dec. 31, 2017		(248)
Number of shares repurchased	(36)
Ending balance at Sep. 30, 2018		(284)
Beginning balance at Mar. 31, 2018		(267)
Number of shares repurchased		(12)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2018		(279)
Number of shares repurchased	(5)	(5)
Number of shares returned - stock compensation		0
Ending balance at Sep. 30, 2018		(284)
Beginning balance at Dec. 31, 2018	(295)	(295)
Number of shares repurchased		(14)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2019		(309)
Beginning balance at Dec. 31, 2018	(295)	(295)
Number of shares repurchased	(33)
Ending balance at Sep. 30, 2019	(328)	(328)
Beginning balance at Mar. 31, 2019		(309)
Number of shares repurchased		(9)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2019		(318)
Number of shares repurchased	(10)	(10)
Number of shares returned - stock compensation		0
Ending balance at Sep. 30, 2019	(328)	(328)

X

- Definition

Number of shares (or other type of equity) forfeited during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29,30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_TreasuryStockShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ 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
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration