NOTES PAYABLE - Summary of Notes Payable (Parenthetical) (Detail) $ in Millions, ¥ in Billions	1 Months Ended
	Oct. 31, 2017 JPY (¥)	Jan. 31, 2017 JPY (¥)	Sep. 30, 2016 USD ($)	Mar. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Jul. 31, 2012 USD ($)	Feb. 29, 2012 USD ($)	Aug. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 JPY (¥)	Nov. 30, 2017	Feb. 28, 2017	Dec. 31, 2016 JPY (¥)	Sep. 30, 2016 JPY (¥)	Oct. 31, 2012 USD ($)
2.65% senior notes paid February 2017
Debt Instrument [Line Items]
Debt instrument, interest rate								2.65%	2.65%						2.65%	2.65%
Debt instrument, principal amount								$ 250	$ 400
Debt instrument, term								5 years	5 years
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Debt instrument, interest rate				2.40%								2.40%	2.40%			2.40%
Debt instrument, principal amount				$ 550								$ 550
Debt instrument, term				5 years
4.00% senior notes due February 2022
Debt Instrument [Line Items]
Debt instrument, interest rate									4.00%			4.00%	4.00%			4.00%
Debt instrument, principal amount									$ 350			$ 350
Debt instrument, term									10 years
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Debt instrument, interest rate						3.625%						3.625%	3.625%			3.625%
Debt instrument, principal amount						$ 700						$ 700
Debt instrument, term						10 years
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Debt instrument, interest rate					3.625%							3.625%	3.625%			3.625%
Debt instrument, principal amount					$ 750							$ 750
Debt instrument, term					10 years
3.25% senior notes due March 2025
Debt Instrument [Line Items]
Debt instrument, interest rate				3.25%								3.25%	3.25%			3.25%
Debt instrument, principal amount				$ 450								$ 450
Debt instrument, term				10 years
2.875% senior notes due October 2026
Debt Instrument [Line Items]
Debt instrument, interest rate			2.875%									2.875%	2.875%			2.875%	2.875%
Debt instrument, principal amount			$ 300
Debt instrument, term			10 years
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Debt instrument, interest rate												6.90%	6.90%			6.90%
Debt instrument, principal amount											$ 400
Debt instrument, term											30 years
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Debt instrument, interest rate												6.45%	6.45%			6.45%
Debt instrument, principal amount										$ 450
Debt instrument, term										30 years
4.00% senior notes due October 2046
Debt Instrument [Line Items]
Debt instrument, interest rate			4.00%									4.00%	4.00%			4.00%	4.00%
Debt instrument, principal amount			$ 400
Debt instrument, term			30 years
5.50% subordinated notes due September 2052
Debt Instrument [Line Items]
Debt instrument, interest rate							5.50%							5.50%		5.50%		5.50%
Debt instrument, principal amount							$ 450											$ 50
Debt instrument, term							40 years
.932% senior notes due January 2027
Debt Instrument [Line Items]
Debt instrument, interest rate		0.932%										0.932%	0.932%
Debt instrument, principal amount | ¥		¥ 60.0											¥ 60.0
Debt instrument, term		10 years
2.108% subordinated notes due October 2047
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	The debentures bear interest at an initial rate of 2.108% per annum through October 22, 2027, or earlier redemption. Thereafter, the rate of the interest of the debentures will be reset every five years at a rate of interest equal to the then-current JPY 5-year Swap Offered Rate plus 205 basis points.
Debt instrument, interest rate	2.108%											2.108%	2.108%
Debt instrument, principal amount | ¥	¥ 60.0												¥ 60.0
Debt instrument, term	30 years
Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms			bears an interest rate per annum equal to the Tokyo interbank market rate (TIBOR), or alternate TIBOR, if applicable, plus the applicable TIBOR margin and has a five-year maturity. The applicable margin ranges between .20% and .60%, depending on the Parent Company's debt ratings as of the date of determination.
Debt Instrument, Description of Variable Rate Basis			Tokyo interbank market rate (TIBOR), or alternate TIBOR, if applicable, plus the applicable TIBOR margin
Debt instrument, interest rate												0.32%	0.32%			0.31%
Debt instrument, principal amount | ¥													¥ 5.0			¥ 5.0	¥ 5.0
Debt instrument, term			5 years
Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms			bears an interest rate per annum equal to TIBOR, or alternate TIBOR, if applicable, plus the applicable TIBOR margin and has a seven-year maturity. The applicable margin ranges between .35% and .75%, depending on the Parent Company's debt ratings as of the date of determination.
Debt Instrument, Description of Variable Rate Basis			TIBOR, or alternate TIBOR, if applicable, plus the applicable TIBOR margin
Debt instrument, interest rate												0.47%	0.47%			0.46%
Debt instrument, principal amount | ¥													¥ 25.0			¥ 25.0	¥ 25.0
Debt instrument, term			7 years
Upper Limit | Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.60%
Upper Limit | Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.75%
Lower Limit | Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.20%
Lower Limit | Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.35%