XML 69 R55.htm IDEA: XBRL DOCUMENT v3.4.0.3
Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]            
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions $ 0   $ 0 $ 0    
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 $ 12     48 $ 12 $ 48
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 133     219    
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount (32)     (34)    
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount (22)     (23)    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount [1] (25)     (1)    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 4     (3)    
Income Tax Expense (Benefit) 58     158    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0 $ 0   $ 0    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 0          
[1] [1]Income tax benefit from partial reduction of capital loss carryover valuation allowance in the three months ended March 31, 2016 is due to taxable gains on the termination of certain derivatives during the period.