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Shareholders' Equity - Accelerated Share Repurchase Activity and Related Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | Apr. 30, 2016
August 2017 ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program completion date | 2017-11 |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) | 15,069 |  |  |  |  |  |  |  |
ASR amount | $ 3,000 |  |  |  |  |  |  |  |
May 2017 ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program completion date |  |  |  | 2017-08 |  |  |  |  |
Number of shares repurchased (in shares) |  | 4,500 | 15,600 | 20,108 |  |  |  |  |
Average repurchase price per share (in dollars per share) |  |  |  | $ 149.20 |  |  |  |  |
ASR amount |  |  |  | $ 3,000 |  |  |  |  |
February 2017 ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program completion date |  |  |  |  | 2017-05 |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  | 20,949 |  |  |  |
Average repurchase price per share (in dollars per share) |  |  |  |  | $ 143.20 |  |  |  |
ASR amount |  |  |  |  | $ 3,000 |  |  |  |
November 2016 ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program completion date |  |  |  |  |  | 2017-02 |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  | 51,157 |  |  |
Average repurchase price per share (in dollars per share) |  |  |  |  |  | $ 117.29 |  |  |
ASR amount |  |  |  |  |  | $ 6,000 |  |  |
August 2016 ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program completion date |  |  |  |  |  |  | 2016-11 |  |
Number of shares repurchased (in shares) |  |  |  |  |  |  | 26,850 |  |
Average repurchase price per share (in dollars per share) |  |  |  |  |  |  | $ 111.73 |  |
ASR amount |  |  |  |  |  |  | $ 3,000 |  |
May 2016 ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program completion date |  |  |  |  |  |  |  | 2016-08 |
Number of shares repurchased (in shares) |  |  |  |  |  |  |  | 60,452 |
Average repurchase price per share (in dollars per share) |  |  |  |  |  |  |  | $ 99.25 |
ASR amount |  |  |  |  |  |  |  | $ 6,000 |
November 2015 ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program completion date |  |  |  |  |  |  |  |  | 2016-04
Number of shares repurchased (in shares) |  |  |  |  |  |  |  |  | 29,122
Average repurchase price per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 103.02
ASR amount |  |  |  |  |  |  |  |  | $ 3,000

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- Definition Stock Repurchase Program Completion Date + References No definition available. + Details
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- Definition The up-front payment in exchange for initial delivery of Company shares under the accelerated share repurchase arrangement ("ASR"). Shareholders' equity is charged for this amount in the period of payment. This payment is distinct from a "settlement" cash or share transaction, which takes place at the conclusion of the ASR. + References No definition available. + Details
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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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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. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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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