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Share Repurchase Programs (Details) $ in Billions |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 29, 2016 USD ($) agreement | Apr. 30, 2017 shares | Sep. 30, 2018 USD ($) shares | Jan. 31, 2017 shares | Jan. 06, 2017
2016 Repurchase Program |  |  |  |  |
Share repurchases |  |  |  |  |
Share repurchase program, authorized amount |  |  | $ 15.0 |  |
Amount available for repurchases |  |  | $ 13.9 |  |
Repurchase of common stock (in shares) | shares |  |  | 0 |  |
2014 Repurchase Program |  |  |  |  |
Share repurchases |  |  |  |  |
Share repurchase program, authorized amount |  |  | $ 10.0 |  |
2014 Repurchase Program | August 29, 2016 |  |  |  |  |
Share repurchases |  |  |  |  |
Number of agreements | agreement | 2 |  |  |  |
Amount under ASR agreement | $ 3.6 |  |  |  |
ASR, shares received as a percent of notional amount |  |  |  |  | 80.00%
Shares repurchased under ASR agreement (in shares) | shares |  |  |  | 36,100,000 |
ASR, shares to be received at end of program as a percent of notional amount |  | 20.00% |  |  |
ASR, maximum number of shares (in shares) | shares |  | 9,900,000 |  |  |
Transfer of shares to treasury stock value | 2.9 |  |  |  |
2014 Repurchase Program | Forward contract | August 29, 2016 |  |  |  |  |
Share repurchases |  |  |  |  |
Derivative, Notional Amount | $ 0.7 |  |  |  |

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