SCHEDULE IV REINSURANCE (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total Premiums
Gross amount (direct)	$ 4,562	$ 4,272	$ 4,043
Ceded to other companies	90	79	76
Assumed from other companies	21	21	20
Net amount	4,493	4,214	3,987
Percentage of amount assumed to net	0.50%	0.50%	0.50%
Life insurance in force
Total Premiums
Gross amount (direct)	43,810	42,086	40,431
Ceded to other companies	21,897	22,753	22,303
Assumed from other companies
Net amount	21,913	19,333	18,128
Percentage of amount assumed to net	0.00%	0.00%	0.00%
Life insurance premiums for the year
Total Premiums
Gross amount (direct)	113	108	104
Ceded to other companies	42	43	42
Assumed from other companies
Net amount	71	65	62
Percentage of amount assumed to net	0.00%	0.00%	0.00%
Property and liability insurance premiums for the year
Total Premiums
Gross amount (direct)	4,449	4,164	3,939
Ceded to other companies	48	36	34
Assumed from other companies	21	21	20
Net amount	$ 4,422	$ 4,149	$ 3,925
Percentage of amount assumed to net	0.50%	0.50%	0.50%