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Equity - Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 04, 2013
Share repurchases |  |  |  |  |
Total cash utilized |  | $ 1,240 | $ 1,660 | $ 1,001 |
Stock repurchased during period (shares) | 400,000 | 5,900,000 | 8,400,000 | 6,800,000 |
2013 Stock Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program number of shares authorized to be repurchased (shares) |  |  |  |  | 50,000,000
Maximum number of shares authorized for repurchase under stock repurchase plan as percentage of outstanding common stock (as a percent) |  |  |  |  | 18.00%
Remaining shares available under repurchase program (shares) |  | 4,700,000 |  |  |
Stock Repurchases |  |  |  |  |
Share repurchases |  |  |  |  |
Total number of shares purchased (shares) |  | 1,200,000 | 900,000 | 3,500,000 |
Average price paid per share (USD per share) |  | $ 208.83 | $ 182.93 | $ 141.60 |
Total cash utilized |  | $ 240 | $ 160 | $ 501 |

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