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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)

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- Definition Number of shares (or other type of equity) forfeited during the period. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- 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
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Data Type: | xbrli:sharesItemType
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Period Type: | instant

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- 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
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