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Stock Based Compensation - Schedule of Stock Options and SARs Transactions (Details) - Stock Options And SARs - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Number of Stock Options/SARs |  |
Beginning balance (in shares) | 9,969 | 10,186
Granted (in shares) | 2 | 14
Exercised (in shares) | (3,928) | (239)
Forfeited (in shares) | (137) | (234)
Ending balance (in shares) | 5,906 | 9,727
Vested or Expected to Vest (in shares) | 5,603 | 9,421
Exercisable (in shares) | 2,305 | 6,023
Weighted Average Exercise Price |  |
Beginning balance (in USD per share) | $ 84.37 | $ 84.08
Granted (in USD per share) | 97.64 | 64.97
Exercised (in USD per share) | 93.12 | 69.85
Forfeited (in USD per share) | 87.54 | 91.54
Ending balance (in USD per share) | 78.49 | 84.23
Vested or Expected to Vest (in USD per share) | 79.15 | 84.91
Exercisable (in USD per share) | $ 97.46 | $ 97.08
Additional Disclosures |  |
Intrinsic value of stock options/SARs exercised | $ 108 | $ 3
Intrinsic value of stock options/SARs outstanding | $ 202 | $ 114
Weighted average remaining contractual life for stock options/SARs outstanding (in years) | 4 years 6 months | 3 years 9 months 18 days
Intrinsic value of stock options/SARs vested or expected to vest | $ 189 | $ 106
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years) | 4 years 4 months 24 days | 3 years 9 months 18 days
Aggregate intrinsic value for exercisable units | $ 44 | $ 16
Weighted average remaining contractual life for exercisable options/SARs (in years) | 2 years 8 months 12 days | 2 years 8 months 12 days

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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