INVESTMENTS - Details of Holdings of Perpetual Securities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Amortized Cost	$ 64,399	$ 59,515
Fair Value	67,318	61,038
Unrealized Gain (Loss)	2,919	1,523
Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	3,057	2,987
Fair Value	3,016	2,947
Unrealized Gain (Loss)	(41)	(40)
Upper Tier II: | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	1,967	1,920
Fair Value	1,965	1,913
Unrealized Gain (Loss)	(2)	(7)
Upper Tier II: | A | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	149	145
Fair Value	185	183
Unrealized Gain (Loss)	36	38
Upper Tier II: | BBB | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	1,601	1,563
Fair Value	1,582	1,532
Unrealized Gain (Loss)	(19)	(31)
Upper Tier II: | BB or lower | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	217	212
Fair Value	198	198
Unrealized Gain (Loss)	(19)	(14)
Tier I: | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	876	858
Fair Value	822	825
Unrealized Gain (Loss)	(54)	(33)
Tier I: | BBB | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	764	746
Fair Value	696	706
Unrealized Gain (Loss)	(68)	(40)
Tier I: | BB or lower | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	112	112
Fair Value	126	119
Unrealized Gain (Loss)	14	7
Other subordinated - non-banks | BB or lower | Perpetual securities:
Investment Holdings [Line Items]
Amortized Cost	214	209
Fair Value	229	209
Unrealized Gain (Loss)	$ 15	$ 0