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Income Taxes (Summary of Taxes on Financial Statements) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]        
Income Tax Expense (Benefit) $ (391) $ (86) $ (421) $ (129)
CTA, taxes   (3) 4 27
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax   (22) 10 18
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax   0 0 0
Income Tax Expense (Benefit), Intraperiod Tax Allocation   $ (111) $ (407) $ (84)