NOTES PAYABLE AND LEASE OBLIGATIONS - Summary of Notes Payable (Parenthetical) (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2020 JPY (¥)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 JPY (¥)	Jan. 31, 2020	Dec. 31, 2019 JPY (¥)	Sep. 30, 2019 JPY (¥)	Apr. 12, 2019 JPY (¥)	Oct. 31, 2018 USD ($)	Oct. 31, 2018 JPY (¥)	Oct. 31, 2017 JPY (¥)	Jan. 31, 2017 JPY (¥)	Dec. 31, 2016	Sep. 30, 2016 USD ($)	Mar. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Feb. 29, 2012 USD ($)	Aug. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
4.00% senior notes paid January 2020
Debt Instrument [Line Items]
Debt instrument, interest rate				4.00%	4.00%												4.00%
Debt instrument, principal amount | $																	$ 350
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Debt instrument, interest rate	3.625%				3.625%											3.625%
Debt instrument, principal amount | $																$ 700
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	3.625%				3.625%										3.625%
Debt instrument, principal amount | $															$ 750
3.25% senior notes due March 2025
Debt Instrument [Line Items]
Debt instrument, interest rate	3.25%				3.25%									3.25%
Debt instrument, principal amount | $														$ 450
2.875% senior notes due October 2026
Debt Instrument [Line Items]
Debt instrument, interest rate	2.875%				2.875%								2.875%
Debt instrument, principal amount | $													$ 300
3.60% senior notes due April 2030
Debt Instrument [Line Items]
Debt instrument, interest rate	3.60%	3.60%
Debt instrument, principal amount | $		$ 1,000
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
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
4.00% senior noted due October 2046
Debt Instrument [Line Items]
Debt instrument, interest rate	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
.300% senior notes due September 2025
Debt Instrument [Line Items]
Debt instrument, interest rate	0.30%		0.30%
Debt instrument, principal amount	¥ 12,400		¥ 12,400
.932% senior notes due January 2027
Debt Instrument [Line Items]
Debt instrument, interest rate	0.932%				0.932%						0.932%
Debt instrument, principal amount	¥ 60,000				¥ 60,000						¥ 60,000
.500% senior notes due December 2029
Debt Instrument [Line Items]
Debt instrument, interest rate	0.50%				0.50%
Debt instrument, principal amount	¥ 12,600				¥ 12,600
.550% senior notes due March 2030
Debt Instrument [Line Items]
Debt instrument, interest rate	0.55%		0.55%
Debt instrument, principal amount	¥ 13,300		¥ 13,300
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	¥ 29,300				¥ 29,300				¥ 29,300
.843% senior notes due December 2031
Debt Instrument [Line Items]
Debt instrument, interest rate	0.843%				0.843%
Debt instrument, principal amount	¥ 9,300				¥ 9,300
.750% senior notes due March 2032
Debt Instrument [Line Items]
Debt instrument, interest rate	0.75%		0.75%
Debt instrument, principal amount	¥ 20,700		¥ 20,700
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	¥ 15,200				¥ 15,200				¥ 15,200
.934% senior notes due December 2034
Debt Instrument [Line Items]
Debt instrument, interest rate	0.934%				0.934%
Debt instrument, principal amount	¥ 9,800				¥ 9,800
.830% senior notes due March 2035
Debt Instrument [Line Items]
Debt instrument, interest rate	0.83%		0.83%
Debt instrument, principal amount	¥ 10,600		¥ 10,600
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	¥ 8,900				¥ 8,900				¥ 8,900
1.122% senior notes due December 2039
Debt Instrument [Line Items]
Debt instrument, interest rate	1.122%				1.122%
Debt instrument, principal amount	¥ 6,300				¥ 6,300
2.108% subordinated notes due October 2047
Debt Instrument [Line Items]
Debt instrument, interest rate	2.108%				2.108%					2.108%
Debt instrument, principal amount	¥ 60,000				¥ 60,000					¥ 60,000
.963% subordinated bonds due April 2049
Debt Instrument [Line Items]
Debt instrument, interest rate	0.963%				0.963%		0.963%
Debt instrument, principal amount	¥ 30,000				¥ 30,000		¥ 30,000
Yen-denominated loan variable interest rate due September 2026
Debt Instrument [Line Items]
Debt instrument, interest rate	0.43%				0.42%
Debt instrument, principal amount	¥ 5,000				¥ 5,000	¥ 5,000
Yen-denominated loan variable interest rate due September 2029
Debt Instrument [Line Items]
Debt instrument, interest rate	0.58%				0.57%
Debt instrument, principal amount	¥ 25,000				¥ 25,000	¥ 25,000