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Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 89 | $ 185 | $ 211 | $ 378 |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount | (31) | (31) | (91) | (94) |  |  |  |
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount | (37) | (14) | (75) | (57) |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 0 | 0 | 0 | 78 |  |  |  |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount | 0 | (50) | 5 | (50) |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 5 | 0 | (6) | 3 |  |  |  |
Provision for income taxes | 22 | 90 | 32 | 102 |  |  |  |
Unrecognized Tax Benefits | 15 | 12 | 15 | 12 | $ 12 | $ 12 | $ 12 | $ 12
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 3 | 0 | 3 | 0 |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 0 | 0 | $ 0 | 0 |  |  |  |
Income Tax Examination, Description |  |  | The federal audit of the years 2012 and 2013 was completed as of March 31, 2017 with no additional adjustments. The federal audit of The Company's recently acquired subsidiary Maxum for the 2014 tax year is expected to be completed in the fourth quarter of 2017 with no significant adjustments. Management believes that adequate provision has been made in the consolidated financial statements for any potential adjustments that may result from tax examinations and other tax-related matters for all open tax years. |  |  |  |  |
Stock-based Compensation [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Amount | $ (4) | $ 0 | $ (12) | $ 0 |  |  |  |

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- Definition A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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