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Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Summary of Common Stock Purchases |
The following table provides the number of shares of our common stock purchased and the cost of purchases under our publicly announced share-purchase plans, including our accelerated share repurchase agreements:
(SHARES IN MILLIONS, DOLLARS IN BILLIONS) |  | 2018(a) |  |  | 2017(b) |  |  | 2016(c) |
Shares of common stock purchased |  | 307 |  |  | 150 |  |  | 154 |
Cost of purchase |  | $ | 12.2 |  |  | $ | 5.0 |  |  | $ | 5.0 |
(a) | Represents shares purchased pursuant to the accelerated share repurchase agreement with Citibank entered into on March 12, 2018, as well as other share repurchases. See above for additional information.
(b) | Represents shares purchased pursuant to the accelerated share repurchase agreement with Citibank entered into on February 2, 2017. See above for additional information.
(c) | Represents shares purchased pursuant to the accelerated share repurchase agreement entered into on March 8, 2016. See above for additional information.

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