NOTES PAYABLE - Summary of Notes Payable (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Notes payable	$ 5,252	$ 5,360
2.65% senior notes paid February 2017
Debt Instrument [Line Items]
Notes payable	0	649
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Notes payable	545	547
4.00% senior notes due February 2022
Debt Instrument [Line Items]
Notes payable	346	348
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Notes payable	694	696
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Notes payable	743	745
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	298
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable	221	220
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Notes payable	256	254
4.00% senior notes due October 2046
Debt Instrument [Line Items]
Notes payable	394	394
5.50% subordinated notes due September 2052
Debt Instrument [Line Items]
Notes payable	494	486
.932% senior notes due January 2027
Debt Instrument [Line Items]
Notes payable	532	0
Yen-denominated loan variable interest rate due September 2021
Debt Instrument [Line Items]
Notes payable	44	43
Yen-denominated loan variable interest rate due September 2023
Debt Instrument [Line Items]
Notes payable	222	214
Capitalized lease obligations
Debt Instrument [Line Items]
Notes payable	$ 18	$ 21