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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A summary of the changes in each component of accumulated other comprehensive (loss) income, net of tax for the years ended December 31, 2017 and 2016 is provided below:
(dollars in millions) |  | Foreign Currency Translation |  |  | Defined Benefit Pension and Postretirement Plans |  |  | Unrealized Gains (Losses) on Available-for- Sale Securities |  |  | Unrealized Hedging (Losses) Gains |  |  | Accumulated Other Comprehensive (Loss) Income |
Balance at December 31, 2015 |  | $ | (2,438 | ) |  | $ | (5,135 | ) |  | $ | 293 |  |  | $ | (339 | ) |  | $ | (7,619 | )
Other comprehensive (loss) income before reclassifications, net |  | (1,042 | ) |  | (247 | ) |  | 119 |  |  | 54 |  |  | (1,116 | )
Amounts reclassified, pre-tax |  | — |  |  | 535 |  |  | (94 | ) |  | 171 |  |  | 612 |
Tax (benefit) expense reclassified |  | — |  |  | (198 | ) |  | 35 |  |  | (48 | ) |  | (211 | )
Balance at December 31, 2016 |  | $ | (3,480 | ) |  | $ | (5,045 | ) |  | $ | 353 |  |  | $ | (162 | ) |  | $ | (8,334 | )
Other comprehensive income before reclassifications, net |  | 540 |  |  | 78 |  |  | 3 |  |  | 264 |  |  | 885 |
Amounts reclassified, pre-tax |  | (10 | ) |  | 529 |  |  | (566 | ) |  | (39 | ) |  | (86 | )
Tax (benefit) expense reclassified |  | — |  |  | (214 | ) |  | 215 |  |  | 9 |  |  | 10 |
Balance at December 31, 2017 |  | $ | (2,950 | ) |  | $ | (4,652 | ) |  | $ | 5 |  |  | $ | 72 |  |  | $ | (7,525 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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