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Stockholders' Equity - Repurchase of Common Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | May 08, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Value of shares repurchased |  | $ 324,700,000 |  |  |  |  |
Shares acquired under program (in shares) |  | 69,963,816 |  |  | 61,485,423 |  |
July 2015 Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 1,500,000,000
Stock repurchase program, authorized increase |  |  | $ 1,500,000,000.0 |  |  |  |
Number of shares repurchased (in shares) |  | 8,794,954 | 0 |  |  |  |
Value of shares repurchased |  | $ 404,700,000 |  |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 400,000,000 |
Shares acquired under program (in shares) | 8,308,692 |  |  |  | 7,089,056 |  |
Shares acquired, average price per share (in usd per share) | $ 48.14 |  |  |  |  |  |
Share Trading Plan | Common Stock Repurchase Set One |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 7,575,318 |  |  |  |  |
Value of shares repurchased |  | $ 324,700,000 |  |  |  |  |
Shares acquired, average price per share (in usd per share) |  | $ 42.86 |  |  |  |  |
Subsequent Event | July 2015 Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized increase |  |  |  | $ 1,000,000,000.0 |  |  |

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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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