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Equity - Schedule of Repurchased Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) | 3,661 | 3,730 | 4,170 | 5,871 | 1,863 | 3,991 | 6,298 | 4,105 | 3,498 | 3,642 | 3,916 | 3,911 | 10,041 | 10,403 | 7,828 | 13,771 | 14,394 | 11,469 | 17,432 | 16,257 | 14,967
Average Repurchase Price Per Share (in dollars per share) | $ 92.86 | $ 91.16 | $ 81.53 | $ 74.95 | $ 74.99 | $ 75.17 | $ 72.81 | $ 73.08 | $ 68.62 | $ 65.90 | $ 61.28 | $ 58.49 |  |  |  |  |  |  | $ 83.75 | $ 73.71 | $ 63.39
Amount of Repurchases | $ 340 | $ 340 | $ 340 | $ 440 | $ 139 | $ 300 | $ 459 | $ 300 | $ 240 | $ 240 | $ 240 | $ 229 |  |  |  |  |  |  | $ 1,460 | $ 1,198 | $ 949
Shares purchased | $ 540 | $ 880 | $ 1,220 | $ 1,560 | $ 2 | $ 141 | $ 441 | $ 900 | $ 51 | $ 291 | $ 531 | $ 771 | $ 1,220 | $ 441 | $ 531 | $ 880 | $ 141 | $ 291 | $ 540 | $ 2 | $ 51
Open Market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 | 2,200 |
Amount of Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 159 |
Rule 10b5-1 Trading Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,100 | 14,100 |
Amount of Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400 | $ 1,000 |

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