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Income Tax Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]      
Unrecognized Tax Benefits, Period Increase (Decrease) $ 36    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 186 $ 301 $ 196
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount 152 109 135
Income Tax Reconciliation, Deductions, Foreign Investments 3 8 7
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount (1) 0 (5)
Income Tax Expense (Benefit) $ 30 $ 184 $ 49