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Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Tax Contingency [Line Items]          
Liability for Uncertain Tax Positions, Noncurrent $ 48,000,000   $ 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 2016. Management believes that adequate provision has been made in the financial statements for any potential assessments that may result from tax examinations and other tax-related matters for all open tax years.    
Unrecognized Tax Benefits 0   $ 0   $ 48,000,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 164,000,000 $ 53,000,000 383,000,000 $ 266,000,000  
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount (33,000,000) (34,000,000) (67,000,000) (69,000,000)  
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount (72,000,000) (26,000,000) (95,000,000) (53,000,000)  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 4,000,000 3,000,000 3,000,000 3,000,000  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount (6,000,000) 4,000,000 (9,000,000) (4,000,000)  
Income Tax Expense (Benefit) $ 57,000,000 $ 0 $ 215,000,000 $ 143,000,000