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Share Repurchase Transactions and Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Federal Home Loan Banks [Abstract] |
Components of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss are as follows (dollars in millions):
|  | Unrealized Gains on Available- for-Sale Securities |  |  | Foreign Currency Translation Adjustments |  |  | Defined Benefit Plans |  |  | Change in Fair Value of Derivative Instruments |  |  | Total |
Balances at December 31, 2020 |  | $ | 25 |  |  | $ | (271 | ) |  | $ | (220 | ) |  | $ | (36 | ) |  | $ | (502 | )
Unrealized losses on available-for-sale securities, net of $2 income tax benefit |  |  | (9 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9 | )
Foreign currency translation adjustments, net of $1 of income tax |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  | 7 |
Change in fair value of derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | 1 |
Expense reclassified into operations from other comprehensive income, net of $2 and $2 income tax benefits, respectively |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  | 7 |  |  |  | 12 |
Balances at March 31, 2021 |  | $ | 16 |  |  | $ | (264 | ) |  | $ | (215 | ) |  | $ | (28 | ) |  | $ | (491 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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