SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplementary insurance information
Deferred policy acquisition costs	$ 487	$ 467	$ 467
Reserves for losses, loss expenses, life policy deposit contracts	5,170	5,187	5,138
Unearned premiums	2,178	2,082	1,981
Premiums earned	4,214	3,987	3,869
Net investment income	433	433	433
Benefits, claims, losses and settlement expenses	3,444	2,900	2,728
Amortization of deferred policy acquisition costs	680	651	624
Other operating expenses	342	318	379
Net premiums written (excluding life)	4,255	4,019	3,861
Property and casualty insurance operations
Supplementary insurance information
Deferred policy acquisition costs	343	327	313
Reserves for losses, loss expenses, life policy deposit contracts	3,499	3,584	3,598
Unearned premiums	2,178	2,082	1,981
Premiums earned	4,149	3,925	3,808
Net investment income	324	325	326
Benefits, claims, losses and settlement expenses	3,344	2,810	2,639
Amortization of deferred policy acquisition costs	668	635	611
Other operating expenses	327	303	364
Net premiums written (excluding life)	4,255	4,019	3,861
Life insurance operations
Supplementary insurance information
Deferred policy acquisition costs	144	140	154
Reserves for losses, loss expenses, life policy deposit contracts	1,671	1,603	1,540
Unearned premiums	0	0	0
Premiums earned	65	62	61
Net investment income	93	96	93
Benefits, claims, losses and settlement expenses	100	90	89
Amortization of deferred policy acquisition costs	12	16	13
Other operating expenses	15	15	15
Net premiums written (excluding life)	0	0	0
Management operations
Supplementary insurance information
Deferred policy acquisition costs	0	0	0
Reserves for losses, loss expenses, life policy deposit contracts	0	0	0
Unearned premiums	0	0	0
Premiums earned	0	0	0
Net investment income	16	12	14
Benefits, claims, losses and settlement expenses	0	0	0
Amortization of deferred policy acquisition costs	0	0	0
Other operating expenses	0	0	0
Net premiums written (excluding life)	$ 0	$ 0	$ 0