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Stock Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 04, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Number of shares remaining available for future issuance (in shares) |  | 40,334,683 |  |
Future compensation not yet recognized in the Statements of Income |  | $ 237 |  |
Future compensation to be recognized in 2021 |  | 115 |  |
Future compensation to be recognized in 2022 |  | 77 |  |
Future compensation to be recognized in 2023 |  | 40 |  |
Future compensation to be recognized in 2024 |  | 5 |  |
Remaining stock repurchase authorizations |  | $ 10,630 |  |
Employee stock purchase plan |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Percent of the underlying common stock's market price participants pay for options (in hundredths) |  | 85.00% |  |
ESPP option term (in months) |  | three |  |
Number of shares remaining available for future issuance (in shares) |  | 33,097,602 |  |
Aggregate intrinsic values of options exercised |  | $ 14 | $ 13 | $ 13
Weighted-average exercise price, Exercised (in dollars per share) |  | $ 103.48 |  |
Outstanding options exercisable (in shares) |  | 0 |  |
Weighted average grant date fair value of options granted (dollars per share) |  | $ 19.19 | $ 18.05 | $ 15.43
Employee stock purchase plan | Subsequent Event |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Weighted-average exercise price, Exercised (in dollars per share) | $ 137.89 |  |  |
Long-term incentive and director compensation plans | Employee Stock Option |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Term of the long term incentive stock options |  | 10 years |  |
Award vesting period (in years) |  | 4 years |  |
Aggregate intrinsic values of options exercised |  | $ 681 | $ 819 | $ 561
Future compensation not yet recognized in the Statements of Income |  | $ 103 |  |
Weighted-average exercise price, Exercised (in dollars per share) |  | $ 53.28 |  |
Outstanding options exercisable (in shares) |  | 17,221,451 |  |
Long-term incentive and director compensation plans | Restricted Stock Units (RSUs) |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Award vesting period (in years) |  | 4 years |  |
Weighted-average grant-date fair value, Granted (in dollars per share) |  | $ 130.59 | $ 106.58 | $ 110.05
Total fair values of shares vested from RSU lapses |  | $ 110 | $ 125 | $ 123
Future compensation not yet recognized in the Statements of Income |  | $ 134 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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