Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 32	$ 45		$ 87	$ 194
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	(16)	(35)		(57)	(129)
Income Tax Reconciliation, Deductions, Foreign Investments	(3)	2		(6)	(2)
Income Tax Expense (Benefit)	$ 13	12		$ 24	63
Unrecognized Tax Benefits, Period Increase (Decrease)					$ 36
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			$ 48
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		$ 12
Income Tax Examination, Description				The federal audit of the years 2012 and 2013 began in March 2015 and is expected to be completed in 2017. 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.