Fair Value Measurements (Details - Measured under Certain Conditions) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Percentage Of Impaired Commercial Mortgage Loans Of Total Investments	less than 1%
Realized Investment Losses Commercial Mortgage Loans	$ 7
Percentage Of Impaired Commercial Mortgage Loans And Real Estate Entities Of Total Investments		less than 1%
Realized Investment Losses Commercial Mortgage Loans And Real Estate Entities		$ 15