NOTES PAYABLE - Summary of Notes Payable (Parenthetical) (Details) ¥ in Millions, $ in Millions	Jun. 30, 2015 USD ($)	Jun. 30, 2015 JPY (¥)	Apr. 30, 2015	Mar. 31, 2015 USD ($)	Dec. 31, 2014 JPY (¥)
8.50% senior notes due May 2019
Debt Instrument [Line Items]
Notes payable, interest rate			8.50%		8.50%
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Notes payable, interest rate	6.45%	6.45%			6.45%
3.45% senior notes due August 2015
Debt Instrument [Line Items]
Notes payable, interest rate	3.45%	3.45%			3.45%
2.65% senior notes due February 2017
Debt Instrument [Line Items]
Notes payable, interest rate	2.65%	2.65%			2.65%
Notes payable, principal amount	$ 400
4.00% senior notes due February 2022
Debt Instrument [Line Items]
Notes payable, interest rate	4.00%	4.00%			4.00%
Notes payable, principal amount	$ 350
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Notes payable, interest rate	3.625%	3.625%			3.625%
Notes payable, principal amount	$ 700
3.25% senior notes due March 2025
Debt Instrument [Line Items]
Notes payable, interest rate	3.25%	3.25%		3.25%
Notes payable, principal amount	$ 450			$ 450
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable, interest rate	6.90%	6.90%			6.90%
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Notes payable, interest rate	2.40%	2.40%		2.40%
Notes payable, principal amount	$ 550			$ 550
5.50% subordinated notes due September 2052
Debt Instrument [Line Items]
Notes payable, interest rate	5.50%	5.50%			5.50%
Notes payable, principal amount	$ 500
2.26% yen-denominated Uridashi notes due September 2016
Debt Instrument [Line Items]
Notes payable, interest rate	2.26%	2.26%			2.26%
Notes payable, principal amount | ¥		¥ 8,000			¥ 8,000
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Notes payable, interest rate	3.625%	3.625%			3.625%
Notes payable, principal amount	$ 750
1.84% yen-denominated Samurai notes due July 2016
Debt Instrument [Line Items]
Notes payable, interest rate	1.84%	1.84%			1.84%
Notes payable, principal amount | ¥		¥ 15,800			¥ 15,800
3.60% yen-denominated loan due July 2015
Debt Instrument [Line Items]
Notes payable, interest rate	3.60%	3.60%			3.60%
Notes payable, principal amount | ¥		¥ 10,000			¥ 10,000
3.00% yen-denominated loan due August 2015
Debt Instrument [Line Items]
Notes payable, interest rate	3.00%	3.00%			3.00%
Notes payable, principal amount | ¥		¥ 5,000			¥ 5,000
50 billion yen line of credit
Debt Instrument [Line Items]
Line of credit facility, amount outstanding | ¥		¥ 0
$50 million dollar line of credit
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 0
$100 million dollar line of credit
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 0