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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($) $ / shares in Units, shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Weighted Average Grant Date Fair Value |  |  |
Tax benefit realized from vesting | $ 100,000,000 | $ 82,000,000 | $ 141,000,000
Restricted Stock and Restricted Stock Units |  |  |
Number of Shares |  |  |
Beginning balance (in shares) | 1,722 | 1,573 | 1,789
Granted - Annual (in shares) | 822 | 733 | 564
Granted - Other (in shares) | 0 | 45 | 15
Vested/Distributed (in shares) | (462) | (570) | (732)
Forfeited (in shares) | (95) | (59) | (63)
Ending balance (in shares) | 1,987 | 1,722 | 1,573
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (in dollars per share) | $ 189.78 | $ 201.11 | $ 180.02
Granted - Annual (in dollars per share) | 176.82 | 157.29 | 200.41
Granted - Other (in dollars per share) | 0 | 159.49 | 180.08
Vested/Distributed (in dollars per share) | 228.94 | 176.20 | 149.33
Forfeited (in dollars per share) | 176.13 | 196.31 | 192.52
Ending balance (in dollars per share) | $ 175.96 | $ 189.78 | $ 201.11
Compensation expense yet to be recognized | $ 94,000,000 |  |
Expense recognition period (in months and in years) | 24 months |  |
Fair value that vested | $ 83,000,000 | $ 91,000,000 | $ 144,000,000
Tax benefit realized from vesting | $ 16,000,000 | $ 17,000,000 | $ 28,000,000
Vesting or performance period (in years) | 3 years |  |
Value of dividend equivalents for restricted stock units that are forfeited | $ 0 |  |
Impact on basic earnings per share due to restricted stock units dividends | $ 0 |  |
Performance Shares |  |  |
Number of Shares |  |  |
Beginning balance (in shares) | 423 | 444 | 562
Granted - Annual (in shares) | 166 | 203 | 166
Vested/Distributed (in shares) | (115) | (206) | (210)
Performance change (in shares) | 40 | 25 | (48)
Forfeited (in shares) | (33) | (43) | (26)
Ending balance (in shares) | 481 | 423 | 444
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (in dollars per share) | $ 188.61 | $ 205.58 | $ 188.96
Granted - Annual (in dollars per share) | 176.79 | 153.16 | 207.49
Vested/Distributed (in dollars per share) | 228.80 | 190.84 | 162.16
Performance change (in dollars per share) | 176.35 | 166.49 | 204.73
Forfeited (in dollars per share) | 171.35 | 172.92 | 209.96
Ending balance (in dollars per share) | $ 175.12 | $ 188.61 | $ 205.58
Compensation expense yet to be recognized | $ 15,000,000 |  |
Expense recognition period (in months and in years) | 20 months |  |
Fair value that vested | $ 22,000,000 | $ 35,000,000 | $ 45,000,000
Tax benefit realized from vesting | $ 4,000,000 | $ 7,000,000 | $ 9,000,000
Vesting or performance period (in years) | 3 years |  |
Performance shares awarded at estimated number of shares at the end of the performance period (as a percent) | 100.00% |  |
Performance Shares | Minimum |  |  |
Weighted Average Grant Date Fair Value |  |  |
Expense recognition period (in months and in years) | 1 year |  |
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions (as a percent) | 0.00% |  |
Performance Shares | Maximum |  |  |
Weighted Average Grant Date Fair Value |  |  |
Expense recognition period (in months and in years) | 3 years |  |
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions (as a percent) | 200.00% |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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