NOTES PAYABLE - Summary of Notes Payable (Parenthetical) (Details) $ in Millions, ¥ in Billions	Mar. 31, 2016 USD ($)	Mar. 31, 2016 JPY (¥)	Dec. 31, 2015 JPY (¥)
2.65% senior notes due February 2017
Debt Instrument [Line Items]
Debt instrument, interest rate	2.65%	2.65%	2.65%
Debt instrument, principal amount	$ 400
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Debt instrument, interest rate	2.40%	2.40%	2.40%
Debt instrument, principal amount	$ 550
4.00% senior notes due February 2022
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
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Debt instrument, interest rate	6.90%	6.90%	6.90%
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Debt instrument, interest rate	6.45%	6.45%	6.45%
5.50% subordinated notes due September 2052
Debt Instrument [Line Items]
Debt instrument, interest rate	5.50%	5.50%	5.50%
Debt instrument, principal amount	$ 500
2.26% yen-denominated Uridashi notes due September 2016
Debt Instrument [Line Items]
Debt instrument, interest rate	2.26%	2.26%	2.26%
Debt instrument, principal amount | ¥		¥ 8.0	¥ 8.0
1.84% yen-denominated Samurai notes due July 2016
Debt Instrument [Line Items]
Debt instrument, interest rate	1.84%	1.84%	1.84%
Debt instrument, principal amount | ¥		¥ 15.8	¥ 15.8