Schedule II (details) - Other Revenues Footnote (details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011
Schedule of debt
Pretax loss recognized related to the purchase of a portion of the 6.25% fixed-to-floating rate junior subordinated debentures	$ 60
6.25% Fixed-to-floating rate junior subordinated debentures due March 15, 2067 [Member]
Schedule of debt
Interest rate (percent)	6.25%	6.25%
Principal	1,000
Debt, principal amount repurchased	885
Pretax loss recognized related to the purchase of a portion of the 6.25% fixed-to-floating rate junior subordinated debentures	$ 60