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Equity - Summary of Common Stock Purchases (Details) - USD ($) shares in Millions, $ in Millions |  |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 20, 2016 | Mar. 10, 2016 | Mar. 11, 2018 | [1] | Dec. 31, 2018 | [1] | Dec. 31, 2017 | [2] | Dec. 31, 2016 | [3]
Equity [Abstract] |  |  |  |  |  |  |  |  |
Shares of common stock purchased | 18 | 136 |  | 307 |  | 150 |  | 154 |
Cost of purchase |  |  | $ 8,200 | $ 12,198 | [4] | $ 5,000 | [4] | $ 5,000 | [4]
[1] | 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.
[2] | Represents shares purchased pursuant to the accelerated share repurchase agreement with Citibank entered into on February 2, 2017. See above for additional information.
[3] | Represents shares purchased pursuant to the accelerated share repurchase agreement entered into on March 8, 2016. See above for additional information.
[4] | Amounts may not add due to rounding.

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