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Equity - Accelerated Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Aug. 01, 2017 | Dec. 07, 2016 | Sep. 07, 2016 | Dec. 31, 2015 | Dec. 07, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  |  |  | 0.3 |  |  |  |
Average price paid per share (in dollars per share) |  |  |  |  | $ 98.98 |  | $ 147.74 | $ 113.36 | $ 99.00
Accelerated Share Repurchases, August 2017 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Authorized amount |  | $ 500,000,000 |  |  |  |  |  |  |
Accelerated share repurchase, settlement (payment) or receipt |  | $ (500,000,000) |  |  |  |  |  |  |
Total number of shares purchased (in shares) | 3.2 |  |  |  |  |  |  |  |
Average price paid per share (in dollars per share) | $ 154.46 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, August 2017 | Initial Award |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  | 2.8 |  |  |  |  |  |  |
Authorized amount repurchased (as a percent) |  | 85.00% |  |  |  |  |  |  |
Accelerated Share Repurchases, August 2017 | Additional Award |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | 0.5 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, September 2016 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Authorized amount |  |  |  | $ 750,000,000 |  |  |  |  |
Accelerated share repurchase, settlement (payment) or receipt |  |  |  | $ (750,000,000) |  |  |  |  |
Total number of shares purchased (in shares) |  |  | 0.9 |  |  | 6.1 |  |  |
Average price paid per share (in dollars per share) |  |  |  |  |  | $ 122.18 |  |  |
Accelerated Share Repurchases, September 2016 | Initial Award |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  |  | 4.4 |  |  |  |  |
Accelerated Share Repurchases, September 2016 | Additional Award |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  |  | 0.9 |  |  |  |  |

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + 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 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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