Contingencies and Other Matters (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Contingencies And Other Matters Details [Abstract]
Guaranteed Separate Accounts Liability	$ 559,000,000
Separate Accounts Liability Sold Business Percent Reinsured	21.00%
Underlying mutual fund investment values for Guaranteed Minimum Income Benefits	1,100,000,000
Maximum potential undiscounted payments under Guaranteed Minimum Income Benefits assumptions	1,100,000,000
Percentage of GMIB exposure covered by retrocessional coverage	55.00%
Indemnification Obligations To Lenders	331,000,000
Liabilities Required Indemnification Obligations Real Estate Joint Ventures	no
Leased equipment value deficiency guarantees	41,000,000
Guarantee For Lease Shortfall Expiring 2025	25,000,000
Guarantee For Lease Shortfall Expiring 2016	16,000,000
Guarantee Liability For Lease Shortfall	2,000,000
Liabilities Required Indemnification Obligations Acquisitions and Dispositions	no liabilities
Charges for administrative service only bank guarantees Text String	no material charges
Liabilities Required Bank Service Guarantees	no
Estimated Potential Guaranty Fund Assessments	60,000,000
After Tax Charges For Guaranty Fund Assessments	not material	not material
Litigation reserves pre tax	189,000,000
Litigation reserves after tax	123,000,000
Litigation Charge Pre Tax	124,000,000
Litigation Charge After Tax	$ 81,000,000