Receivables (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Receivables [Abstract]
Reinsurance	$ 6,092	$ 7,204
Insurance	1,726	1,717
Receivable from brokers	275	103
Accrued investment income	442	426
Federal income taxes	164	150
Other, primarily customer accounts	801	946
Total	9,500	10,546
Less: allowance for doubtful accounts on reinsurance receivables	91	125
allowance for other doubtful accounts	150	279
Receivables	$ 9,259	$ 10,142