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Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]                
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 185,000,000 $ 133,000,000   $ 378,000,000 $ 516,000,000      
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount (31,000,000) (33,000,000)   (94,000,000) (100,000,000)      
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount (14,000,000) (36,000,000)   (57,000,000) (131,000,000)      
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 0 (60,000,000)   (78,000,000) (57,000,000)      
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount (50,000,000) 0   (50,000,000) 0      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 0 3,000,000   3,000,000 (6,000,000)      
Income Tax Expense (Benefit) 90,000,000 7,000,000   102,000,000 222,000,000      
HFPI estimated tax benefit on disposition 65,000,000              
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   60,000,000     60,000,000      
Unrecognized Tax Benefits, Period Increase (Decrease)         36,000,000      
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 0 0 $ (48,000,000) 0 (48,000,000)      
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0 12,000,000   0 12,000,000      
Unrecognized Tax Benefits $ 12,000,000 $ 12,000,000 $ 0 $ 12,000,000 $ 12,000,000 $ 12,000,000 $ 12,000,000 $ 48,000,000
Income Tax Examination, Description       The federal audit of the years 2012 and 2013 began in March 2015 and is expected to be completed in 2017. 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.