INVESTMENTS (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Debt Maturities
Total amortized cost	$ 284,872	$ 281,710
Total fair value	282,777	283,753
Mortgage-backed securities
Available-for-sale Securities, Debt Maturities
Due within 1 year, amortized cost	87	10
After 1 but within 5 years, amortized cost	346	365
After 5 but within 10 years, amortized cost	2,898	1,992
After 10 years, amortized cost	49,723	51,598
Total amortized cost	53,054	53,965
Fair value, due within 1 year	87	10
Fair value, after 1 but within 5 years	354	374
Fair value, after 5 but within 10 years	2,932	2,124
Fair value, after 10 years	49,282	52,963
Total fair value	52,655	55,471
U.S. Treasury and federal agency securities
Available-for-sale Securities, Debt Maturities
Due within 1 year, amortized cost	15,789	9,387
After 1 but within 5 years, amortized cost	66,232	76,454
After 5 but within 10 years, amortized cost	2,129	2,171
After 10 years, amortized cost	3,061	2,669
Total amortized cost	87,211	90,681
Fair value, due within 1 year	15,853	9,499
Fair value, after 1 but within 5 years	66,457	77,267
Fair value, after 5 but within 10 years	2,185	2,408
Fair value, after 10 years	3,101	2,667
Total fair value	87,596	91,841
State and municipal securities
Available-for-sale Securities, Debt Maturities
Due within 1 year, amortized cost	576	208
After 1 but within 5 years, amortized cost	3,731	3,221
After 5 but within 10 years, amortized cost	439	155
After 10 years, amortized cost	16,015	16,436
Total amortized cost	20,761	20,020
Fair value, due within 1 year	581	208
Fair value, after 1 but within 5 years	3,735	3,223
Fair value, after 5 but within 10 years	482	165
Fair value, after 10 years	14,142	14,736
Total fair value	18,940	18,332
Foreign government
Available-for-sale Securities, Debt Maturities
Due within 1 year, amortized cost	37,022	34,873
After 1 but within 5 years, amortized cost	51,446	49,587
After 5 but within 10 years, amortized cost	7,332	7,239
After 10 years, amortized cost	945	1,599
Total amortized cost	96,745	93,298
Fair value, due within 1 year	36,959	34,869
Fair value, after 1 but within 5 years	51,304	49,933
Fair value, after 5 but within 10 years	7,216	7,380
Fair value, after 10 years	992	1,865
Total fair value	96,471	94,047
All other
Available-for-sale Securities, Debt Maturities
Due within 1 year, amortized cost	2,786	1,001
After 1 but within 5 years, amortized cost	10,934	11,285
After 5 but within 10 years, amortized cost	5,632	4,330
After 10 years, amortized cost	7,749	7,130
Total amortized cost	27,101	23,746
Fair value, due within 1 year	2,733	1,009
Fair value, after 1 but within 5 years	11,020	11,351
Fair value, after 5 but within 10 years	5,641	4,505
Fair value, after 10 years	7,721	7,197
Total fair value	$ 27,115	$ 24,062