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Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income Tax Examination, Description |  |  |  | The federal audit of the years 2012 and 2013 began in March 2015 and is expected to be completed in 2016. Management believes that adequate provision has been made in the financial statements for any potential adjustments that may result from tax examinations and other tax-related matters for all open tax years. |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  | $ 36,000,000 |  |
Income Tax Examination, Interest Expense |  |  |  | 0 | $ 0 | $ 5,000,000
Interest Payable | $ 0 |  |  | 0 | 1,000,000 |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount |  |  |  | 692,000,000 | 595,000,000 | 515,000,000
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount |  |  |  | 132,000,000 | 138,000,000 | 138,000,000
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount |  |  |  | 156,000,000 | 114,000,000 | 139,000,000
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  | (102,000,000) | 5,000,000 | (2,000,000)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  | 3,000,000 | 2,000,000 | 10,000,000
Income Tax Expense (Benefit) |  |  |  | 305,000,000 | 350,000,000 | 246,000,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  | $ 48,000,000 | 48,000,000 |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  | $ 12,000,000 |  | 12,000,000 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 60,000,000 |  |  | 94,000,000 |  |
Unrecognized Tax Benefits | $ 12,000,000 |  |  | $ 12,000,000 | 48,000,000 | 48,000,000
Valuation Allowance of Deferred Tax Assets [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  |  | $ 5,000,000 | $ (2,000,000)

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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=6907707&loc=d3e32718-109319 + Details
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