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
Effective Income Tax Rate Reconciliation [Abstract]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 48		$ 0
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 52	84	$ 55	149
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	(21)	(71)	(41)	(94)
Income Tax Reconciliation, Deductions, Foreign Investments	(1)	(2)	(3)	(4)
Income Tax Expense (Benefit)	$ 30	$ 11	$ 11	$ 51
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.