INVESTMENTS - Details of Holdings of Perpetual Securities (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Amortized Cost	$ 66,607	$ 59,515
Fair Value	71,020	61,038
Unrealized Gain (Loss)	4,413	1,523
Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	3,041	2,987
Fair Value	3,168	2,947
Unrealized Gain (Loss)	127	(40)
Upper Tier II: | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	1,996	1,920
Fair Value	2,084	1,913
Unrealized Gain (Loss)	88	(7)
Upper Tier II: | A | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	151	145
Fair Value	193	183
Unrealized Gain (Loss)	42	38
Upper Tier II: | BBB | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	1,625	1,563
Fair Value	1,689	1,532
Unrealized Gain (Loss)	64	(31)
Upper Tier II: | BB or lower | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	220	212
Fair Value	202	198
Unrealized Gain (Loss)	(18)	(14)
Tier I: | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	828	858
Fair Value	827	825
Unrealized Gain (Loss)	(1)	(33)
Tier I: | BBB | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	776	746
Fair Value	753	706
Unrealized Gain (Loss)	(23)	(40)
Tier I: | BB or lower | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	52	112
Fair Value	74	119
Unrealized Gain (Loss)	22	7
Other subordinated - non-banks | BB or lower | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	217	209
Fair Value	257	209
Unrealized Gain (Loss)	$ 40	$ 0