Insurance Liabilities (Details 2)	12 Months Ended
	Dec. 31, 2011 USD ($) agreement	Dec. 31, 2010 USD ($)	Dec. 31, 2011 1998 Funding agreement program USD ($)	Dec. 31, 2010 1998 Funding agreement program USD ($)	Dec. 31, 1998 1998 Funding agreement program USD ($)	Dec. 31, 2011 2001 Funding agreement program USD ($)	Dec. 31, 2010 2001 Funding agreement program USD ($)	Dec. 31, 2001 2001 Funding agreement program USD ($)	Dec. 31, 2011 2004 Funding agreement program USD ($)	Dec. 31, 2010 2004 Funding agreement program USD ($)	Nov. 30, 2007 2004 Funding agreement program USD ($)	Feb. 28, 2006 2004 Funding agreement program USD ($)	Mar. 31, 2004 2004 Funding agreement program USD ($)	Dec. 31, 2011 2006 Funding agreement program USD ($)	Dec. 31, 2010 2006 Funding agreement program USD ($)	Dec. 31, 2006 2006 Funding agreement program USD ($)	Dec. 31, 2006 2006 Funding agreement program EUR (€)	Dec. 31, 2011 2011 Funding agreement program USD ($)
Insurance Liabilities
Number of separate funding agreement programs	5
Number of funding agreement programs not guaranteed by PFG	3
Funding agreement disclosures
Authorized amount of funding agreements to be issued					$ 4,000,000,000			$ 7,000,000,000					$ 4,000,000,000			$ 5,300,000,000	€ 4,000,000,000	$ 2,000,000,000
Funding agreements	8,850,100,000	10,226,900,000	1,377,200,000	2,055,400,000		2,205,000,000	2,224,700,000		2,452,500,000	3,597,800,000				1,305,700,000	1,340,000,000
Additional authorized amount of funding agreements to be issued											5,000,000,000	5,000,000,000
Amount of funding agreement authorization used at time additional amount authorized											9,000,000,000	4,000,000,000
Funding Agreement Liabilities Held																		$ 250,200,000