v3.8.0.1

Income Taxes (Operating and Capital Loss Carryforwards) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |
Alternative minimum tax credits | $ 0 | $ 66 |
Effective tax rate | (22.20%) | 23.40% | 26.70%
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 0 | $ 0 |
State and local |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 5,806 | 4,201 |
Foreign operations |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 58 | $ 45 |
Foreign operations | Operating loss expiring between 2018 and 2035 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 16 |  |
Foreign operations | Operating loss unlimited carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 42 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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