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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Share Based Compensation and Related Benefits In 2022, 2021 and 2020, we recorded share-based compensation and related benefits as follows:
 Year ended December 31,
(Dollars in millions)202220212020
Share-based compensation expense$183 $136 $84 
Income tax benefit related to share-based compensation expense(39)(35)(20)
Capitalized compensation costs3 1 1 
Unrecognized Share Based Compensation Expense As of December 31, 2022, unrecognized share-based compensation expense was as follows:
(Dollars in millions)Unrecognized 
Expense		Weighted Average Expected Recognition Period - in Years  
Stock options$13 2.39 years
Restricted stock awards/units235 2.68 years
Total unrecognized share-based compensation expense$248 
Weighted Average Assumptions and Fair Values Used for Employee Stock Options and Restricted Stock Units The following weighted average assumptions and fair values were used for our employee stock options and restricted stock units:
Equity Incentive Plan Awards202220212020
Weighted average expected term of options - in years4.74.74.6
Weighted average expected volatility of the Company's underlying common stock46.1 %43.5 %41.9 %
Risk-free interest rate3.06 0.85 0.37 
Expected dividend yield— — — 
Weighted average grant date fair value - stock options$202.81 $224.63 $66.44 
Weighted average grant date fair value - restricted stock units463.10 554.32 199.51 
Weighted Average Assumptions and Fair Values Used for ESPP
The following weighted average assumptions and fair values were used for our ESPP:
ESPP202220212020
Expected term in years0.50.50.5
Weighted average expected volatility of the Company's underlying common stock43.5 %36.2 %51.9 %
Risk-free interest rate1.04 0.08 1.12 
Expected dividend yield— — — 
Weighted average grant date fair value$156.24 $108.83 $69.54 
Stock Option Information Related to Equity Incentive Plan
The table below provides stock option information for the year ended December 31, 2022:
OptionsWeighted
Average
 Exercise Price 		Weighted Average Remaining Contractual Life - in Years  Aggregate Intrinsic Value of 
In-The-Money Options
Outstanding at December 31, 2021475,626 $260.77 
Granted77,888 477.80 
Exercised(40,326)184.75 
Forfeited(23,546)385.40 
Outstanding at December 31, 2022489,642 295.48 3.80$11,968,937 
Vested and expected to vest at December 31, 2022480,972 293.91 3.7711,851,281 
Exercisable at December 31, 2022300,872 238.23 2.849,528,647 
Information for Restricted Stock Units under Equity Incentive Plan
The table below provides information for restricted stock units for the year ended December 31, 2022:
Shares    Weighted Average Grant Date Fair Value
Nonvested at December 31, 20211,016,146 $328.87 
Granted548,856 463.10 
Vested(390,593)279.34 
Forfeited(91,957)379.94 
Nonvested at December 31, 20221,082,452 405.62 
Summary of Information Regarding Stock Option and Restricted Stock Activity
The following table summarizes information regarding stock option and restricted stock unit activity during 2022, 2021 and 2020:
Year ended December 31,
(Dollars in millions)202220212020
Total intrinsic value of stock options exercised$14 $68 $25 
Total fair value of stock options vested14 7 6 
Total intrinsic value of restricted stock vested205 164 56 
Total fair value of restricted stock vested126 68 47