NOTES PAYABLE - Summary of Notes Payable (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Notes payable	$ 5,765	$ 4,971
2.65% senior notes due February 2017
Debt Instrument [Line Items]
Notes payable	650	651
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Notes payable	547	546
4.00% senior notes due February 2022
Debt Instrument [Line Items]
Notes payable	348	348
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Notes payable	696	696
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Notes payable	745	744
3.25% senior notes due March 2025
Debt Instrument [Line Items]
Notes payable	445	445
2.875% senior notes due October 2026
Debt Instrument [Line Items]
Notes payable	298	0
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable	394	393
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Notes payable	445	445
4.00% senior notes due October 2046
Debt Instrument [Line Items]
Notes payable	393	0
5.50% subordinated notes due September 2052
Debt Instrument [Line Items]
Notes payable	486	486
2.26% yen-denominated Uridashi notes paid September 2016
Debt Instrument [Line Items]
Notes payable	0	66
1.84% yen-denominated Samurai notes paid July 2016
Debt Instrument [Line Items]
Notes payable	0	131
Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Notes payable	49	0
Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Notes payable	247	0
Capitalized Lease Obligations
Debt Instrument [Line Items]
Notes payable	$ 22	$ 20