NOTES PAYABLE - Additional Information (Detail)	12 Months Ended			1 Months Ended			1 Months Ended						1 Months Ended									1 Months Ended						1 Months Ended				1 Months Ended						1 Months Ended			1 Months Ended			1 Months Ended			1 Months Ended			1 Months Ended	12 Months Ended							12 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2014	Feb. 29, 2012 series	Jul. 31, 2011 series	Nov. 30, 2014 3.625% senior notes due November 2024 USD ($)	Nov. 30, 2014 3.625% senior notes due November 2024 JPY (¥)	Dec. 31, 2014 3.625% senior notes due November 2024 USD ($)	Jun. 30, 2013 3.625% senior notes due June 2023 USD ($)	Jun. 30, 2013 3.625% senior notes due June 2023 JPY (¥)	Dec. 31, 2014 3.625% senior notes due June 2023 USD ($)	Dec. 31, 2013 3.625% senior notes due June 2023	Dec. 31, 2013 1.47% yen-denominated Samurai notes paid July 2014 JPY (¥)	Jul. 31, 2011 1.47% yen-denominated Samurai notes paid July 2014 JPY (¥)	Jul. 31, 2011 1.84% yen-denominated Samurai notes due July 2016 JPY (¥)	Dec. 31, 2014 1.84% yen-denominated Samurai notes due July 2016 JPY (¥)	Dec. 31, 2013 1.84% yen-denominated Samurai notes due July 2016 JPY (¥)	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 3.00% yen-denominated loan due August 2015 JPY (¥)	Dec. 31, 2013 3.00% yen-denominated loan due August 2015 JPY (¥)	Feb. 29, 2012 Senior Notes USD ($)	Jul. 31, 2012 2.65% senior notes due February 2017 USD ($)	Feb. 29, 2012 2.65% senior notes due February 2017 USD ($)	Feb. 29, 2012 2.65% senior notes due February 2017 JPY (¥)	Dec. 31, 2014 2.65% senior notes due February 2017 USD ($)	Dec. 31, 2013 2.65% senior notes due February 2017	Jul. 31, 2011 Yen Denominated Samurai Notes JPY (¥)	Feb. 29, 2012 4.00% senior notes due February 2022 USD ($)	Feb. 29, 2012 4.00% senior notes due February 2022 JPY (¥)	Dec. 31, 2014 4.00% senior notes due February 2022 USD ($)	Dec. 31, 2013 4.00% senior notes due February 2022	Oct. 31, 2012 5.50% subordinated notes due September 2052 USD ($)	Oct. 31, 2012 5.50% subordinated notes due September 2052 JPY (¥)	Sep. 30, 2012 5.50% subordinated notes due September 2052 USD ($)	Sep. 30, 2012 5.50% subordinated notes due September 2052 JPY (¥)	Dec. 31, 2014 5.50% subordinated notes due September 2052 USD ($)	Dec. 31, 2013 5.50% subordinated notes due September 2052	Aug. 31, 2010 6.45% senior notes due August 2040 USD ($)	Dec. 31, 2014 6.45% senior notes due August 2040	Dec. 31, 2013 6.45% senior notes due August 2040	Aug. 31, 2010 3.45% senior notes due August 2015 USD ($)	Dec. 31, 2014 3.45% senior notes due August 2015	Dec. 31, 2013 3.45% senior notes due August 2015	Dec. 31, 2009 6.90% senior notes due December 2039 USD ($)	Dec. 31, 2014 6.90% senior notes due December 2039	Dec. 31, 2013 6.90% senior notes due December 2039	May 31, 2009 8.50% senior notes due May 2019 USD ($)	Dec. 31, 2014 8.50% senior notes due May 2019	Dec. 31, 2013 8.50% senior notes due May 2019	Sep. 30, 2006 2.26% yen-denominated Uridashi notes due September 2016 JPY (¥)	Dec. 31, 2009 2.26% yen-denominated Uridashi notes due September 2016 JPY (¥)	Dec. 31, 2014 2.26% yen-denominated Uridashi notes due September 2016 JPY (¥)	Dec. 31, 2013 2.26% yen-denominated Uridashi notes due September 2016 JPY (¥)	Dec. 31, 2014 Notes Payable USD ($)	Dec. 31, 2013 Notes Payable USD ($)	Dec. 31, 2014 Line of credit USD ($)	Dec. 31, 2013 Line of credit USD ($)	Dec. 31, 2014 Fifty billion yen line of credit USD ($)	Dec. 31, 2014 Fifty billion yen line of credit JPY (¥)	Oct. 31, 2014 One hundred million dollar line of credit USD ($)	Dec. 31, 2014 One hundred million dollar line of credit USD ($)
Debt Instrument [Line Items]
Line of credit facility term																																																												364-day
Notes payable, interest rate				3.625%	3.625%	3.625%	3.625%	3.625%	3.625%	3.625%	1.47%		1.84%	1.84%	1.84%		1.30%		3.00%	3.00%		2.65%	2.65%	2.65%	2.65%	2.65%		4.00%	4.00%	4.00%	4.00%	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%		6.45%	6.45%		3.45%	3.45%		6.90%	6.90%		8.50%	8.50%			2.26%	2.26%
Debt Instrument, Term				10 years	10 years		10 years	10 years					5 years									5 years	5 years	5 years				10 years	10 years					40 years	40 years			30 years			5 years			30 years			10 years			10 years
Debt Instrument, redemption, description				These notes are redeemable at our option in whole at any time or in part from time to time at a redemption price equal to the greater of: (i) the aggregate principal amount of the notes to be redeemed or (ii) the amount equal to the sum of the present values of the remaining scheduled payments for principal of and interest on the notes to be redeemed, not including any portion of the payments of interest accrued as of such redemption date, discounted to such redemption date on a semiannual basis at the treasury rate plus 20 basis points, plus in each case, accrued and unpaid interest on the principal amount of the notes to be redeemed to, but excluding, such redemption date.	These notes are redeemable at our option in whole at any time or in part from time to time at a redemption price equal to the greater of: (i) the aggregate principal amount of the notes to be redeemed or (ii) the amount equal to the sum of the present values of the remaining scheduled payments for principal of and interest on the notes to be redeemed, not including any portion of the payments of interest accrued as of such redemption date, discounted to such redemption date on a semiannual basis at the treasury rate plus 20 basis points, plus in each case, accrued and unpaid interest on the principal amount of the notes to be redeemed to, but excluding, such redemption date.		These notes are redeemable at our option in whole at any time or in part from time to time at a redemption price equal to the greater of: (i) the aggregate principal amount of the notes to be redeemed or (ii) the amount equal to the sum of the present values of the remaining scheduled payments for principal of and interest on the notes to be redeemed, not including any portion of the payments of interest accrued as of such redemption date, discounted to such redemption date on a semiannual basis at the treasury rate plus 20 basis points, plus in each case, accrued and unpaid interest on the principal amount of the notes to be redeemed to, but excluding, such redemption date.	These notes are redeemable at our option in whole at any time or in part from time to time at a redemption price equal to the greater of: (i) the aggregate principal amount of the notes to be redeemed or (ii) the amount equal to the sum of the present values of the remaining scheduled payments for principal of and interest on the notes to be redeemed, not including any portion of the payments of interest accrued as of such redemption date, discounted to such redemption date on a semiannual basis at the treasury rate plus 20 basis points, plus in each case, accrued and unpaid interest on the principal amount of the notes to be redeemed to, but excluding, such redemption date.
Debt instrument effective principal amount after cross currency swap					¥ 85,300,000,000			¥ 69,800,000,000																¥ 30,900,000,000					¥ 27,000,000,000				¥ 3,900,000,000		¥ 35,300,000,000
Principal payments under debt obligations																																																			1,400,000,000
Notes payable, principal amount				750,000,000		750,000,000	700,000,000		700,000,000		28,700,000,000	28,700,000,000.0	15,800,000,000.0	15,800,000,000	15,800,000,000	5,500,000,000	5,500,000,000	5,500,000,000.0	5,000,000,000	5,000,000,000	750,000,000	250,000,000	400,000,000		400,000,000		50,000,000,000	350,000,000		350,000,000		50,000,000		450,000,000		500,000,000		450,000,000			300,000,000			400,000,000			850,000,000			10,000,000,000		8,000,000,000	8,000,000,000
Minimum prinicipal amount outstanding following partial redemption																																				25,000,000
Number of series of senior notes issued through a U.S. public debt offering (in series)		2	3
Notes payable, effective interest rate				1.00%	1.00%		1.50%	1.50%								1.475%							1.22%	1.22%				2.07%	2.07%			4.42%	4.42%	4.41%	4.41%
Derivative, Description of Terms																																P5Y	P5Y	P5Y	P5Y
Extinguishment of notes																																																			2,000,000,000
Gain on extinguishment of debt																																																			600,000,000
Line of credit facility, maximum borrowing capacity																																																											50,000,000,000	100,000,000	100,000,000
Line of Credit Facility, Expiration Period Description	This credit agreement will expire on the earlier of March 29, 2018, or the date of termination of the commitments upon an event of default as defined in the agreement.
Line of credit facility, interest rate description																																																										Borrowings will bear interest at LIBOR plus the applicable margin of 1.125%	Borrowings will bear interest at LIBOR plus the applicable margin of 1.125%		Borrowings will bear interest at the rate quoted by the bank and agreed upon at the time of making such loan and will have a three-month maturity period.
Line of credit facility, commitment fee percentage																																																										0.125%	0.125%
Line of credit facility, amount outstanding																																																										0			0
Notes payable, debt default, amount																																																						$ 0	$ 0	$ 0	$ 0