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Share Repurchases Transactions and Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2017 |  | $ | 7 |  |  | $ | (149 | ) |  | $ | (168 | ) |  | $ | 32 |  |  | $ | (278 | )
Unrealized losses on available-for-sale securities, net of $1 income tax benefit |  |  | (7 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7 | )
Foreign currency translation adjustments |  |  | — |  |  |  | (35 | ) |  |  | — |  |  |  | — |  |  |  | (35 | )
Change in fair value of derivative instruments, net of $14 of income taxes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 46 |  |  |  | 46 |
Expense (income) reclassified into operations from other comprehensive income, net of $3 income tax benefit and $1 of income taxes, respectively |  |  | — |  |  |  | — |  |  |  | 12 |  |  |  | (4 | ) |  |  | 8 |
Balances at September 30, 2018 |  | $ | — |  |  | $ | (184 | ) |  | $ | (156 | ) |  | $ | 74 |  |  | $ | (266 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=114867106&loc=SL7669686-108580 + Details
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