DERIVATIVE INSTRUMENTS - Additional Information (Detail)					3 Months Ended	12 Months Ended																					3 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($) Y currency counterparties		Dec. 31, 2013 USD ($)	Dec. 31, 2014 Foreign currency forwards USD ($)	Mar. 31, 2012 Cash flow hedges USD ($)	Dec. 31, 2014 Cash flow hedges USD ($)	Dec. 31, 2013 Cash flow hedges USD ($)	Dec. 31, 2014 Variable interest rate yen-denominated Samurai notes paid July 2014 JPY (¥)	Dec. 31, 2013 Variable interest rate yen-denominated Samurai notes paid July 2014 JPY (¥)	Jul. 31, 2011 Variable interest rate yen-denominated Samurai notes paid July 2014 JPY (¥)	Dec. 31, 2014 3.625% senior notes due November 2024 USD ($)	Nov. 30, 2014 3.625% senior notes due November 2024 USD ($)	Dec. 31, 2014 3.625% senior notes due June 2023 USD ($)	Jun. 30, 2013 3.625% senior notes due June 2023 USD ($)	Dec. 31, 2014 2.65% senior notes due February 2017 USD ($)	Jul. 31, 2012 2.65% senior notes due February 2017 USD ($)	Feb. 29, 2012 2.65% senior notes due February 2017 USD ($)	Dec. 31, 2014 4.00% senior notes due February 2022 USD ($)	Feb. 29, 2012 4.00% senior notes due February 2022 USD ($)	Dec. 31, 2014 5.50% subordinated notes due September 2052 USD ($)	Oct. 31, 2012 5.50% subordinated notes due September 2052 USD ($)	Sep. 30, 2012 5.50% subordinated notes due September 2052 USD ($)	Dec. 31, 2014 July 2014 profit repatriation Foreign currency forwards and options JPY (¥)	Dec. 31, 2014 December 2014 profit repatriation Foreign currency forwards and options JPY (¥)	Dec. 31, 2014 December 2014 profit repatriation Foreign currency forwards JPY (¥)	Dec. 31, 2014 Profit repatriation Foreign currency forwards JPY (¥)	Mar. 31, 2012 Net investment hedge USD ($)	Dec. 31, 2014 Net investment hedge USD ($)	Dec. 31, 2013 Net investment hedge USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Number of currencies related to foreign currency swaps	1
Number of counterparties	16
Number of counterparties that comprise majority of aggregate notional amount of swaps	5
Percentage of notional amount of swaps from certain number of counterparties	80.00%
Collateral Already Posted, Aggregate Fair Value	$ 1,600,000,000		$ 8,000,000
Derivative, Collateral, Right to Reclaim Securities	1,621,000,000	[1]	7,000,000	1,439,000,000
Derivative, Collateral, Right to Reclaim Cash			1,000,000
Derivative, Net Liability Position, Aggregate Fair Value	2,100,000,000		18,000,000
Additional Collateral, Aggregate Fair Value	482,000,000
Collateral obtained from third parties	619,000,000		295,000,000
Hedging activity, weighted-average period (in years)	11
Notes payable, principal amount								5,500,000,000	5,500,000,000	5,500,000,000.0	750,000,000	750,000,000	700,000,000	700,000,000	400,000,000	250,000,000	400,000,000	350,000,000	350,000,000	500,000,000	50,000,000	450,000,000
Notes payable, effective interest rate								1.475%				1.00%		1.50%			1.22%		2.07%		4.42%	4.41%
Net Derivatives Notional Amount	23,662,000,000		22,475,000,000			75,000,000	127,000,000																52,500,000,000	50,000,000,000	50,000,000,000	157,500,000,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net					0	0	0
Net investment hedge gain loss reclassified to earnings net																											$ 0	$ 0	$ 0

[1] Consists entirely of pledged securities.