INVESTMENTS - Details of Holdings of Perpetual Securities (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Amortized Cost	$ 65,118	$ 59,515
Fair Value	70,281	61,038
Unrealized Gain (Loss)	5,163	1,523
Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	2,820	2,987
Fair Value	3,026	2,947
Unrealized Gain (Loss)	206	(40)
Upper Tier II: | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	1,849	1,920
Fair Value	1,951	1,913
Unrealized Gain (Loss)	102	(7)
Upper Tier II: | A | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	67	145
Fair Value	87	183
Unrealized Gain (Loss)	20	38
Upper Tier II: | BBB | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	1,465	1,563
Fair Value	1,487	1,532
Unrealized Gain (Loss)	22	(31)
Upper Tier II: | BB or lower | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	317	212
Fair Value	377	198
Unrealized Gain (Loss)	60	(14)
Tier I: | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	770	858
Fair Value	828	825
Unrealized Gain (Loss)	58	(33)
Tier I: | BBB | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	572	746
Fair Value	559	706
Unrealized Gain (Loss)	(13)	(40)
Tier I: | BB or lower | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	198	112
Fair Value	269	119
Unrealized Gain (Loss)	71	7
Other subordinated - non-banks | BB or lower | Perpetual securities
Investment Holdings [Line Items]
Amortized Cost	201	209
Fair Value	247	209
Unrealized Gain (Loss)	$ 46	$ 0