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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock Option Activity [Table Text Block] | Stock option activity for the year ended December 31, 2020 is summarized in the table below:
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life |  | Aggregate Intrinsic Value
| (in millions) |  |  |  | (in years) |  | (in millions)
Outstanding at beginning of period | 32 |  |  | $ | 166 |  |  |  |  |
Granted | 7 |  |  | 311 |  |  |  |  |
Exercised | (10) |  |  | 126 |  |  |  |  |
Forfeited | (1) |  |  | 255 |  |  |  |  |
Outstanding at end of period | 28 |  |  | 211 |  |  | 6.6 |  | $ | 3,937 |
Exercisable at end of period | 13 |  |  | 150 |  |  | 5.0 |  | 2,579 |
Vested and expected to vest, end of period | 27 |  |  | 210 |  |  | 6.5 |  | 3,892 |
Restricted Share Activity [Table Text Block] | Restricted share activity for the year ended December 31, 2020 is summarized in the table below:
(shares in millions) |  | Shares |  | Weighted-Average Grant Date Fair Value per Share
Nonvested at beginning of period |  | 5 |  |  | $ | 207 |
Granted |  | 1 |  |  | 303 |
Vested |  | (2) |  |  | 187 |
Nonvested at end of period |  | 4 |  |  | 256 |
Other Share-Based Compensation Data [Table Text Block] | Other Share-Based Compensation Data
(in millions, except per share amounts) |  | For the Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Stock Options |  |  |  |  |  |
Weighted-average grant date fair value of shares granted, per share |  | $ | 54 |  |  | $ | 46 |  |  | $ | 43 |
Total intrinsic value of stock options exercised |  | 1,736 |  |  | 1,398 |  |  | 1,431 |
Restricted Shares |  |  |  |  |  |
Weighted-average grant date fair value of shares granted, per share |  | 303 |  |  | 259 |  |  | 229 |
Total fair value of restricted shares vested |  | $ | 574 |  |  | $ | 545 |  |  | $ | 521 |
Employee Stock Purchase Plan |  |  |  |  |  |
Number of shares purchased |  | 1 |  |  | 1 |  |  | 2 |
Share-Based Compensation Items |  |  |  |  |  |
Share-based compensation expense, before tax |  | $ | 679 |  |  | $ | 697 |  |  | $ | 638 |
Share-based compensation expense, net of tax effects |  | 619 |  |  | 641 |  |  | 587 |
Income tax benefit realized from share-based award exercises |  | 208 |  |  | 201 |  |  | 239 |
(in millions, except years) |  | December 31, 2020
Unrecognized compensation expense related to share awards |  | $ | 805 |
Weighted-average years to recognize compensation expense |  | 1.4 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The principal assumptions the Company used in calculating grant-date fair value for stock options were as follows:
|  | For the Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Risk-free interest rate |  | 0.2% - 1.4% |  | 1.5% - 2.5% |  | 2.6% - 3.1%
Expected volatility |  | 22.2% - 29.5% |  | 19.4% - 21.6% |  | 18.7% - 19.3%
Expected dividend yield |  | 1.4% - 1.7% |  | 1.4% - 1.8% |  | 1.3% - 1.5%
Forfeiture rate |  | 5.0% |  | 5.0% |  | 5.0%
Expected life in years |  | 5.1 |  | 5.3 |  | 5.6

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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