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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |
Accumulated Other Comprehensive Income (Loss) | ﻿
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three months ended |  | Nine months ended
﻿ |  | September 30, |  | September 30,
﻿ |  | 2018 |  | 2017 |  | 2018 |  | 2017
﻿Beginning balance |  | $ | (693) |  | $ | (871) |  | $ | (529) |  | $ | (1,275)
﻿Other comprehensive (loss) income (2) |  |  | (128) |  |  | 49 |  |  | (281) |  |  | 435
﻿Equity method affiliates (3) |  |  |  |  |  | 4 |  |  | (11) |  |  | 22
﻿Net current-period other comprehensive (loss) income - foreign currency translation adjustment |  |  | (128) |  |  | 53 |  |  | (292) |  |  | 457
﻿Ending balance |  | $ | (821) |  | $ | (818) |  | $ | (821) |  | $ | (818)
﻿
| (1) |  | All amounts are after tax. Amounts in parentheses indicate debits to accumulated other comprehensive loss.
| (2) |  | For the three months ended September 30, 2018 and 2017, tax amounts are not significant. For the nine months ended September 30, 2018 and 2017, amounts are net of ta x benefit of $28 milli o n and tax expense of $47 million, respectively.
| (3) |  | Tax effects are not significant.

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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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