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Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]                
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 60 $ 164 $ 193 $ 383        
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount (31) (33) (63) (67)        
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount (21) (72) (43) (95)        
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (53) 4 (78) 3        
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount (1) (6) 3 (9)        
Income Tax Expense (Benefit) (46) 57 12 215        
Unrecognized Tax Benefits 12 0 12 0 $ 12 $ 12 $ 48 $ 48
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0 0 0 0        
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions $ 0 $ (48) [1] $ 0 $ (48) [1]        
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.          
[1] Gross decreases in 2015 relate to conclusion of the Internal Revenue Service audit of the Company's 2007-2011 federal consolidated corporate income tax returns.