Debt (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended					0 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 6.400% Senior Notes Due 2022 [Member]	Dec. 31, 2011 7.000% Debentures Due 2025 [Member]	Dec. 31, 2011 7.150% Debentures Due 2027 [Member]	Dec. 31, 2011 6.625% Debentures Due 2028 [Member]	Dec. 31, 2011 5.700% Senior Notes Due 2034 [Member]	Jan. 16, 2008 14% Surplus Notes Due 2033 [Member]	Dec. 31, 2011 14% Surplus Notes Due 2033 [Member]	Dec. 31, 2011 Non Variable Interest Entities [Member]	Dec. 31, 2010 Non Variable Interest Entities [Member]	Dec. 31, 2011 Non Variable Interest Entities [Member] 6.400% Senior Notes Due 2022 [Member]		Dec. 31, 2010 Non Variable Interest Entities [Member] 6.400% Senior Notes Due 2022 [Member]		Dec. 31, 2011 Non Variable Interest Entities [Member] 7.000% Debentures Due 2025 [Member]	Dec. 31, 2010 Non Variable Interest Entities [Member] 7.000% Debentures Due 2025 [Member]	Dec. 31, 2011 Non Variable Interest Entities [Member] 7.150% Debentures Due 2027 [Member]	Dec. 31, 2010 Non Variable Interest Entities [Member] 7.150% Debentures Due 2027 [Member]	Dec. 31, 2011 Non Variable Interest Entities [Member] 6.625% Debentures Due 2028 [Member]	Dec. 31, 2010 Non Variable Interest Entities [Member] 6.625% Debentures Due 2028 [Member]	Dec. 31, 2011 Non Variable Interest Entities [Member] 5.700% Senior Notes Due 2034 [Member]		Dec. 31, 2010 Non Variable Interest Entities [Member] 5.700% Senior Notes Due 2034 [Member]		Dec. 31, 2011 Non Variable Interest Entities [Member] 14% Surplus Notes Due 2033 [Member]		Dec. 31, 2010 Non Variable Interest Entities [Member] 14% Surplus Notes Due 2033 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 901	$ 907										$ 275	[1]	$ 281	[1]	$ 56	$ 56	$ 100	$ 100	$ 141	$ 141	$ 329	[2]	$ 329	[2]
Less unamortized discount	1	1
Subtotal	900	906
14% Surplus Notes due 2033								1,000																		940	[3]	945	[3]
Total										$ 1,840	$ 1,851
Long-term debt, interest rate			6.40%	7.00%	7.15%	6.625%	5.70%	14.00%	14.00%
Long-term debt, maturity, year			2022	2025	2027	2028	2034		2033
Initial Callable date			Aug. 15, 2006						Jan. 15, 2013
Callable, price									100
Callable date for fifth anniversary of initial callable date									January 15, 2018
Callable date for subsequent fifth anniversary of initial callable date									January 15, 2023
Latest callable date before maturity									Jan. 15, 2028
Long-term debt, maturity date								Jan. 15, 2033	Jan. 15, 2033

[1] Callable on or after August 15, 2006 at 100.00.

[2] Callable anytime at the greater of 100.00 or the present value of the remaining scheduled payments of principal and interest.

[3] Callable on January 15, 2013 and every fifth anniversary thereafter at 100.00.