Share Repurchase Transactions (Details) - USD ($)
shares in Millions |
Sep. 12, 2016 |
Jun. 16, 2016 |
Jun. 15, 2016 |
Dec. 15, 2015 |
Sep. 30, 2016 |
Jun. 13, 2016 |
Dec. 14, 2015 |
| Equity, Class of Treasury Stock [Line Items] |
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| Value of treasury stock under cash settlement |
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$ 3,100,000
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| Repurchase Authorization 2016 |
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| Equity, Class of Treasury Stock [Line Items] |
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| Stock repurchase program, authorized amount |
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$ 1,000,000,000.0
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| December 2015 ASR |
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| Equity, Class of Treasury Stock [Line Items] |
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| Stock repurchase program, authorized amount |
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$ 250,000,000
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| Accelerated share repurchase, payment |
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$ 250,000,000
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| Accelerated share repurchase, number of initial shares received |
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4.3
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| Accelerated Share Repurchase, Final Shares Delivered |
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1.0
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| Accelerated Share Repurchase, Number of Shares Repurchased |
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5.3
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| June 2016 ASR |
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| Equity, Class of Treasury Stock [Line Items] |
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| Stock repurchase program, authorized amount |
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$ 300,000,000
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| Accelerated share repurchase, payment |
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$ 300,000,000
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| Accelerated share repurchase, number of initial shares received |
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4.3
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| Accelerated Share Repurchase, Final Shares Delivered |
1.0
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| Accelerated Share Repurchase, Number of Shares Repurchased |
5.3
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