Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 30	$ 3
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	(18)	(20)
Income Tax Reconciliation, Deductions, Foreign Investments	(1)	(2)
Income Tax Expense (Benefit)	$ 11	$ (19)
Income Tax Examination, Description	The federal audit of the years 2012 and 2013 began in March 2015 and was completed as of March 31, 2017 with no additional adjustments. 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.