Contingencies and Other Matters (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Contingencies And Other Matters Details [Abstract]
Guaranteed Separate Accounts Liability	$ 548,000,000
Separate Accounts Liability Sold Business Percent Reinsured	19.00%
Underlying mutual fund investment values for Guaranteed Minimum Income Benefits	1,100,000,000
Maximum potential undiscounted payments under Guaranteed Minimum Income Benefits assumptions	990,000,000
Indemnification Obligations To Lenders	288,000,000
Liabilities Required Indemnification Obligations Real Estate Joint Ventures	no
Leased equipment value deficiency guarantees	41,000,000
Guarantee For Lease Shortfall Expiring 2022	25,000,000
Guarantee For Lease Shortfall Expiring 2016	16,000,000
Guarantee Liability For Lease Shortfall	3,000,000
Liabilities Required Indemnification Obligations Acquisitions and Dispositions	0
Estimated Potential Guaranty Fund Assessments	60,000,000
Contribution to establishment of non-profit resulting from Ingenix	10,000,000
After Tax Charges For Guaranty Fund Assessments	not material
Litigation reserves pre tax	189,000,000
Litigation reserves after tax	$ 123,000,000