POLICY LIABILITIES - Changes in Liability for Unpaid Policy Claims (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Less claims paid during the year on claims incurred during:
Total liability for unpaid policy claims	$ 4,034	$ 3,981	$ 3,719
Health insurance
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Unpaid supplemental health claims, beginning of year	3,749	3,524	3,105
Add claims incurred during the year related to:
Current year	8,013	7,703	7,262
Prior years	(173)	(256)	(332)
Total incurred	7,840	7,447	6,930
Less claims paid during the year on claims incurred during:
Current year	5,453	5,401	5,003
Prior years	2,082	1,944	1,787
Total paid	7,535	7,345	6,790
Effect of foreign exchange rate changes on unpaid claims	(283)	123	279
Increase (decrease) in reinsurance recoverable	10	0	0
Total liability for unpaid policy claims	3,781	3,749	3,524
Life insurance
Less claims paid during the year on claims incurred during:
Total liability for unpaid policy claims	$ 253	$ 232	$ 195