v3.20.4

Stockholders' Equity and Earnings per Share - Schedule of Transactions from Employee Option and Share Plans (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 15, 2020 | Nov. 27, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |
Total shares in treasury at beginning of year (in shares) |  |  | 34,082,242 | 35,913,021 | 3,078,470
Total cost |  |  | $ 3,037 | $ 3,238 | $ 342
Shares acquired under repurchase program (in shares) |  |  | 4,828,913 | 15,865,718 | 54,376,181
Average price in $ per share |  |  | $ 129.7 | $ 90.94 | $ 92.07
Amount paid |  |  | $ 627 | $ 1,443 | $ 5,006
Shares delivered (in shares) |  |  | 3,866,203 | 4,513,416 | 4,241,487
Average price in $ per share |  |  | $ 94.26 | $ 93.55 | $ 107.75
Amount received |  |  | $ 71 | $ 84 | $ 39
Shares retired (in shares) | 26,000,000 | 13,200,000 | 26,000,000 | 13,183,081 | 17,300,143
Total shares in treasury at end of year (in shares) |  |  | 9,044,952 | 34,082,242 | 35,913,021
Total cost |  |  | $ 1,037 | $ 3,037 | $ 3,238

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