NOTES PAYABLE - Summary of Notes Payable (Parenthetical) (Detail) $ in Millions, ¥ in Billions	Dec. 31, 2018 USD ($)	Dec. 31, 2018 JPY (¥)	Nov. 30, 2018 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2018 JPY (¥)	Dec. 31, 2017 JPY (¥)	Oct. 31, 2017 JPY (¥)	Jan. 31, 2017 JPY (¥)	Dec. 31, 2016	Sep. 30, 2016 USD ($)	Sep. 30, 2016 JPY (¥)	Mar. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Feb. 29, 2012 USD ($)	Aug. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
2.40% senior notes paid November 2018
Debt Instrument [Line Items]
Debt instrument, interest rate			2.40%			2.40%						2.40%
Debt instrument, principal amount			$ 550									$ 550
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
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
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
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
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
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Debt instrument, interest rate	6.90%	6.90%				6.90%			6.90%
Debt instrument, principal amount																	$ 400
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Debt instrument, interest rate	6.45%	6.45%				6.45%			6.45%
Debt instrument, principal amount																$ 450
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
4.750% senior notes due January 2049
Debt Instrument [Line Items]
Debt instrument, interest rate	4.75%	4.75%		4.75%	4.75%
Debt instrument, principal amount				$ 550
.932% senior notes due January 2027
Debt Instrument [Line Items]
Debt instrument, interest rate	0.932%	0.932%				0.932%		0.932%
Debt instrument, principal amount | ¥		¥ 60.0				¥ 60.0		¥ 60.0
1.159% senior notes due October 2030
Debt Instrument [Line Items]
Debt instrument, interest rate	1.159%	1.159%		1.159%	1.159%
Debt instrument, principal amount | ¥		¥ 29.3			¥ 29.3
1.488% senior notes due October 2033
Debt Instrument [Line Items]
Debt instrument, interest rate	1.488%	1.488%		1.488%	1.488%
Debt instrument, principal amount | ¥		¥ 15.2			¥ 15.2
1.750% senior notes due October 2038
Debt Instrument [Line Items]
Debt instrument, interest rate	1.75%	1.75%		1.75%	1.75%
Debt instrument, principal amount | ¥		¥ 8.9			¥ 8.9
2.108% subordinated notes due October 2047
Debt Instrument [Line Items]
Debt instrument, interest rate	2.108%	2.108%				2.108%	2.108%
Debt instrument, principal amount | ¥		¥ 60.0				¥ 60.0	¥ 60.0
Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	0.32%	0.32%				0.32%
Debt instrument, principal amount | ¥		¥ 5.0				¥ 5.0					¥ 5.0
Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Debt instrument, interest rate	0.47%	0.47%				0.47%
Debt instrument, principal amount | ¥		¥ 25.0				¥ 25.0					¥ 25.0