Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Effective Income Tax Rate Reconciliation [Abstract]
Unrecognized Tax Benefits, Period Increase (Decrease)				$ 0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 48		48
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 12			0
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	45		$ 31	194	$ 246
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	(35)		(31)	(129)	(83)
Income Tax Reconciliation, Deductions, Foreign Investments	2		(2)	(2)	(7)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	0		1	0	1
Income Tax Expense (Benefit)	$ 12		$ (1)	$ 63	$ 157
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.