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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' Equity Note [Abstract] |
Summary of Accumulated Other Comprehensive Income (Loss) | Changes in AOCL, net of tax, by component
Dollars in millions | Accumulated foreign currency translation adjustments |  | Accumulated pension liability adjustments |  | Changes in fair value of derivatives |  | Total
Balance at December 31, 2019 | $ | (315) |  |  | $ | (654) |  |  | $ | (18) |  |  | $ | (987) |
Other comprehensive income (loss) adjustments before reclassifications | 36 |  |  | (130) |  |  | (21) |  |  | (115) |
Amounts reclassified from AOCL | (12) |  |  | 20 |  |  | 11 |  |  | 19 |
Net other comprehensive income (loss) | 24 |  |  | (110) |  |  | (10) |  |  | (96) |
Balance at December 31, 2020 | $ | (291) |  |  | $ | (764) |  |  | $ | (28) |  |  | $ | (1,083) |
Other comprehensive income (loss) adjustments before reclassifications | (11) |  |  | 168 |  |  | 12 |  |  | 169 |
Amounts reclassified from AOCL | 6 |  |  | 15 |  |  | 12 |  |  | 33 |
Net other comprehensive income (loss) | (5) |  |  | 183 |  |  | 24 |  |  | 202 |
Balance at December 31, 2021 | $ | (296) |  |  | $ | (581) |  |  | $ | (4) |  |  | $ | (881) |
Reclassification out of Accumulated Other Comprehensive Income | Reclassifications out of AOCL, net of tax, by component
Dollars in millions | December 31, 2021 |  | December 31, 2020 |  | Affected line item on the Consolidated Statements of Operations
Accumulated foreign currency adjustments |  |  |  |  |
Reclassification of foreign currency adjustments | $ | (6) |  |  | $ | 12 |  |  | Net income attributable to noncontrolling interests and Gain on disposition of assets and investments
Tax benefit | — |  |  | — |  |  | Provision for income taxes
Net accumulated foreign currency | $ | (6) |  |  | $ | 12 |  |  |
Accumulated pension liability adjustments |  |  |  |  |
Amortization of actuarial loss (a) | $ | (32) |  |  | $ | (24) |  |  | See (a) below
Tax benefit | 17 |  |  | 4 |  |  | Provision for income taxes
Net pension and post-retirement benefits | $ | (15) |  |  | $ | (20) |  |  | Net of tax
Changes in fair value for derivatives |  |  |  |  |
Foreign currency hedge and interest rate swap settlements | $ | (16) |  |  | $ | (13) |  |  | Other non-operating income (expense)
Tax benefit | 4 |  |  | 2 |  |  | Provision for income taxes
Net changes in fair value of derivatives | $ | (12) |  |  | $ | (11) |  |  | Net of tax
(a)This item is included in the computation of net periodic pension cost. See Note 11 to our consolidated financial statements for further discussion.
Shares of Common Stock | Shares of common stock
Shares in millions | Shares
Balance at December 31, 2019 | 178.3 |
Common stock issued | 0.8 |
Balance at December 31, 2020 | 179.1 |
Common stock issued | 0.9 |
Balance at December 31, 2021 | 180.0 |
Shares of Treasury Stock | Shares of treasury stock
Shares and dollars in millions | Shares |  | Amount
Balance at December 31, 2019 | 36.5 |  |  | $ | 817 |
Treasury stock acquired, net of ESPP shares issued | 1.8 |  |  | 47 |
Balance at December 31, 2020 | 38.3 |  |  | 864 |
Treasury stock acquired, net of ESPP shares issued | 1.9 |  |  | 79 |
Balance at December 31, 2021 | 40.2 |  |  | $ | 943 |
The table below presents information on our annual share repurchases activity under these programs:
| Year Ended December 31, 2021
| Number of Shares |  | Average Price per Share |  | Dollars in Millions
Repurchases under the $350 million authorized share repurchase program | 1,874,343 |  |  | $ | 41.52 |  |  | $ | 78 |
Withheld to cover shares | 148,535 |  |  | 32.39 |  |  | 4 |
Total | 2,022,878 |  |  | $ | 40.85 |  |  | $ | 82 |
| Year ending December 31, 2020
| Number of Shares |  | Average Price per Share |  | Dollars in Millions
Repurchases under the $350 million authorized share repurchase program | 1,823,434 |  |  | $ | 25.70 |  |  | $ | 47 |
Withheld to cover shares | 168,671 |  |  | 25.65 |  |  | 4 |
Total | 1,992,105 |  |  | $ | 25.70 |  |  | $ | 51 |

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