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RETIREMENT BENEFITS - Fair Value Disclosure (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
U.S. pension and postretirement benefit plans      
Defined Benefit Plan Disclosure      
Other investment liabilities $ (525,000,000) $ (635,000,000)  
Total net assets 12,303,000,000 13,081,000,000  
U.S. pension and postretirement benefit plans | Level 1      
Defined Benefit Plan Disclosure      
Other investment liabilities (10,000,000) (17,000,000)  
U.S. pension and postretirement benefit plans | Level 2      
Defined Benefit Plan Disclosure      
Other investment liabilities (515,000,000) (618,000,000)  
U.S. pension and postretirement benefit plans | Level 3      
Defined Benefit Plan Disclosure      
Other investment liabilities 0 0  
U.S. pension and postretirement benefit plans | U.S. equity      
Defined Benefit Plan Disclosure      
Total assets 694,000,000 773,000,000  
U.S. pension and postretirement benefit plans | U.S. equity | Level 1      
Defined Benefit Plan Disclosure      
Total assets 694,000,000 773,000,000  
U.S. pension and postretirement benefit plans | U.S. equity | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | U.S. equity | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Non-U.S. equity      
Defined Benefit Plan Disclosure      
Total assets 816,000,000 588,000,000  
U.S. pension and postretirement benefit plans | Non-U.S. equity | Level 1      
Defined Benefit Plan Disclosure      
Total assets 816,000,000 588,000,000  
U.S. pension and postretirement benefit plans | Non-U.S. equity | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Non-U.S. equity | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Mutual funds      
Defined Benefit Plan Disclosure      
Total assets 223,000,000 216,000,000  
U.S. pension and postretirement benefit plans | Mutual funds | Level 1      
Defined Benefit Plan Disclosure      
Total assets 223,000,000 216,000,000  
U.S. pension and postretirement benefit plans | Mutual funds | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Mutual funds | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | U.S. Treasury      
Defined Benefit Plan Disclosure      
Total assets 1,172,000,000 1,178,000,000  
U.S. pension and postretirement benefit plans | U.S. Treasury | Level 1      
Defined Benefit Plan Disclosure      
Total assets 1,172,000,000 1,178,000,000  
U.S. pension and postretirement benefit plans | U.S. Treasury | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | U.S. Treasury | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | U.S Agency      
Defined Benefit Plan Disclosure      
Total assets 105,000,000 0  
U.S. pension and postretirement benefit plans | U.S Agency | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | U.S Agency | Level 2      
Defined Benefit Plan Disclosure      
Total assets 105,000,000 113,000,000  
U.S. pension and postretirement benefit plans | U.S Agency | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | U.S. corporate bonds      
Defined Benefit Plan Disclosure      
Total assets 1,681,000,000 1,534,000,000  
U.S. pension and postretirement benefit plans | U.S. corporate bonds | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | U.S. corporate bonds | Level 2      
Defined Benefit Plan Disclosure      
Total assets 1,681,000,000 1,534,000,000  
U.S. pension and postretirement benefit plans | U.S. corporate bonds | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Foreign government      
Defined Benefit Plan Disclosure      
Total assets 309,000,000 0  
U.S. pension and postretirement benefit plans | Foreign government | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Foreign government | Level 2      
Defined Benefit Plan Disclosure      
Total assets 309,000,000 357,000,000  
U.S. pension and postretirement benefit plans | Foreign government | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Non-U.S. corporate bond      
Defined Benefit Plan Disclosure      
Total assets 440,000,000 417,000,000  
U.S. pension and postretirement benefit plans | Non-U.S. corporate bond | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Non-U.S. corporate bond | Level 2      
Defined Benefit Plan Disclosure      
Total assets 440,000,000 417,000,000  
U.S. pension and postretirement benefit plans | Non-U.S. corporate bond | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | State and municipal securities      
Defined Benefit Plan Disclosure      
Total assets 124,000,000 0  
U.S. pension and postretirement benefit plans | State and municipal securities | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | State and municipal securities | Level 2      
Defined Benefit Plan Disclosure      
Total assets 124,000,000 132,000,000  
U.S. pension and postretirement benefit plans | State and municipal securities | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Asset-backed securities      
Defined Benefit Plan Disclosure      
Total assets 42,000,000 41,000,000  
U.S. pension and postretirement benefit plans | Asset-backed securities | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Asset-backed securities | Level 2      
Defined Benefit Plan Disclosure      
Total assets 42,000,000 41,000,000  
U.S. pension and postretirement benefit plans | Asset-backed securities | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Mortgage-backed securities      
Defined Benefit Plan Disclosure      
Total assets 60,000,000 76,000,000  
U.S. pension and postretirement benefit plans | Mortgage-backed securities | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Mortgage-backed securities | Level 2      
Defined Benefit Plan Disclosure      
Total assets 60,000,000 76,000,000  
U.S. pension and postretirement benefit plans | Mortgage-backed securities | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Annuity contracts      
Defined Benefit Plan Disclosure      
Total assets 27,000,000 59,000,000  
U.S. pension and postretirement benefit plans | Annuity contracts | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Annuity contracts | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Annuity contracts | Level 3      
Defined Benefit Plan Disclosure      
Total assets 27,000,000 59,000,000 $ 91,000,000
U.S. pension and postretirement benefit plans | Derivatives      
Defined Benefit Plan Disclosure      
Total assets 527,000,000 649,000,000  
U.S. pension and postretirement benefit plans | Derivatives | Level 1      
Defined Benefit Plan Disclosure      
Total assets 6,000,000 12,000,000  
U.S. pension and postretirement benefit plans | Derivatives | Level 2      
Defined Benefit Plan Disclosure      
Total assets 521,000,000 637,000,000  
U.S. pension and postretirement benefit plans | Derivatives | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Other investments      
Defined Benefit Plan Disclosure      
Total assets 147,000,000 161,000,000  
U.S. pension and postretirement benefit plans | Other investments | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Other investments | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Other investments | Level 3      
Defined Benefit Plan Disclosure      
Total assets 147,000,000 161,000,000 150,000,000
U.S. pension and postretirement benefit plans | Total investments      
Defined Benefit Plan Disclosure      
Total assets 6,367,000,000 6,294,000,000  
Net investments at fair value 7,044,000,000 7,057,000,000  
Plan assets valued at NAV   2,496,000,000 3,284,000,000
U.S. pension and postretirement benefit plans | Total investments | Level 1      
Defined Benefit Plan Disclosure      
Total assets 2,911,000,000 2,767,000,000  
Net investments at fair value 3,039,000,000 2,861,000,000  
U.S. pension and postretirement benefit plans | Total investments | Level 2      
Defined Benefit Plan Disclosure      
Total assets 3,282,000,000 3,307,000,000  
Net investments at fair value 3,831,000,000 3,976,000,000  
U.S. pension and postretirement benefit plans | Total investments | Level 3      
Defined Benefit Plan Disclosure      
Total assets 174,000,000 220,000,000 241,000,000
Net investments at fair value 174,000,000 220,000,000  
U.S. pension and postretirement benefit plans | Cash and short-term investments      
Defined Benefit Plan Disclosure      
Total assets 1,202,000,000 1,398,000,000  
U.S. pension and postretirement benefit plans | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure      
Total assets 138,000,000 111,000,000  
U.S. pension and postretirement benefit plans | Cash and short-term investments | Level 2      
Defined Benefit Plan Disclosure      
Total assets 1,064,000,000 1,287,000,000  
U.S. pension and postretirement benefit plans | Cash and short-term investments | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
U.S. pension and postretirement benefit plans | Other investment receivables      
Defined Benefit Plan Disclosure      
Plan assets valued at NAV 18,000,000 63,000,000  
U.S. pension and postretirement benefit plans | Securities      
Defined Benefit Plan Disclosure      
Plan assets valued at NAV 5,241,000,000 5,961,000,000  
Non U S Pension And Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Other investment liabilities (690,000,000) (726,000,000)  
Total net assets 7,237,000,000 8,441,000,000  
Non U S Pension And Postretirement Benefit Plans | Level 1      
Defined Benefit Plan Disclosure      
Other investment liabilities 0 (3,000,000)  
Non U S Pension And Postretirement Benefit Plans | Level 2      
Defined Benefit Plan Disclosure      
Other investment liabilities (690,000,000) (723,000,000)  
Non U S Pension And Postretirement Benefit Plans | Level 3      
Defined Benefit Plan Disclosure      
Other investment liabilities 0 0  
Non U S Pension And Postretirement Benefit Plans | U.S. equity      
Defined Benefit Plan Disclosure      
Total assets 16,000,000 18,000,000  
Non U S Pension And Postretirement Benefit Plans | U.S. equity | Level 1      
Defined Benefit Plan Disclosure      
Total assets 5,000,000 5,000,000  
Non U S Pension And Postretirement Benefit Plans | U.S. equity | Level 2      
Defined Benefit Plan Disclosure      
Total assets 11,000,000 13,000,000  
Non U S Pension And Postretirement Benefit Plans | U.S. equity | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | Non-U.S. equity      
Defined Benefit Plan Disclosure      
Total assets 343,000,000 388,000,000  
Non U S Pension And Postretirement Benefit Plans | Non-U.S. equity | Level 1      
Defined Benefit Plan Disclosure      
Total assets 74,000,000 83,000,000  
Non U S Pension And Postretirement Benefit Plans | Non-U.S. equity | Level 2      
Defined Benefit Plan Disclosure      
Total assets 222,000,000 257,000,000  
Non U S Pension And Postretirement Benefit Plans | Non-U.S. equity | Level 3      
Defined Benefit Plan Disclosure      
Total assets 47,000,000 48,000,000 49,000,000
Non U S Pension And Postretirement Benefit Plans | Mutual funds      
Defined Benefit Plan Disclosure      
Total assets   24,000,000  
Non U S Pension And Postretirement Benefit Plans | Mutual funds | Level 1      
Defined Benefit Plan Disclosure      
Total assets   0  
Non U S Pension And Postretirement Benefit Plans | Mutual funds | Level 2      
Defined Benefit Plan Disclosure      
Total assets   24,000,000  
Non U S Pension And Postretirement Benefit Plans | Mutual funds | Level 3      
Defined Benefit Plan Disclosure      
Total assets   0  
Non U S Pension And Postretirement Benefit Plans | Commingled funds      
Defined Benefit Plan Disclosure      
Total assets 5,000,000 10,000,000  
Non U S Pension And Postretirement Benefit Plans | Commingled funds | Level 1      
Defined Benefit Plan Disclosure      
Total assets 5,000,000 10,000,000  
Non U S Pension And Postretirement Benefit Plans | Commingled funds | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | Commingled funds | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | U.S. Treasury      
Defined Benefit Plan Disclosure      
Total assets 1,000,000    
Non U S Pension And Postretirement Benefit Plans | U.S. Treasury | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0    
Non U S Pension And Postretirement Benefit Plans | U.S. Treasury | Level 2      
Defined Benefit Plan Disclosure      
Total assets 1,000,000    
Non U S Pension And Postretirement Benefit Plans | U.S. Treasury | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0    
Non U S Pension And Postretirement Benefit Plans | U.S. corporate bonds      
Defined Benefit Plan Disclosure      
Total assets 360,000,000 350,000,000  
Non U S Pension And Postretirement Benefit Plans | U.S. corporate bonds | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | U.S. corporate bonds | Level 2      
Defined Benefit Plan Disclosure      
Total assets 360,000,000 350,000,000  
Non U S Pension And Postretirement Benefit Plans | U.S. corporate bonds | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | Foreign government      
Defined Benefit Plan Disclosure      
Total assets 3,057,000,000 3,434,000,000  
Non U S Pension And Postretirement Benefit Plans | Foreign government | Level 1      
Defined Benefit Plan Disclosure      
Total assets 2,886,000,000 3,213,000,000  
Non U S Pension And Postretirement Benefit Plans | Foreign government | Level 2      
Defined Benefit Plan Disclosure      
Total assets 171,000,000 220,000,000  
Non U S Pension And Postretirement Benefit Plans | Foreign government | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 1,000,000 0
Non U S Pension And Postretirement Benefit Plans | Non-U.S. corporate bond      
Defined Benefit Plan Disclosure      
Total assets 775,000,000 869,000,000  
Non U S Pension And Postretirement Benefit Plans | Non-U.S. corporate bond | Level 1      
Defined Benefit Plan Disclosure      
Total assets 87,000,000 99,000,000  
Non U S Pension And Postretirement Benefit Plans | Non-U.S. corporate bond | Level 2      
Defined Benefit Plan Disclosure      
Total assets 683,000,000 765,000,000  
Non U S Pension And Postretirement Benefit Plans | Non-U.S. corporate bond | Level 3      
Defined Benefit Plan Disclosure      
Total assets 5,000,000 5,000,000 5,000,000
Non U S Pension And Postretirement Benefit Plans | Real estate      
Defined Benefit Plan Disclosure      
Total assets 4,000,000 3,000,000  
Non U S Pension And Postretirement Benefit Plans | Real estate | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | Real estate | Level 2      
Defined Benefit Plan Disclosure      
Total assets 3,000,000 3,000,000  
Non U S Pension And Postretirement Benefit Plans | Real estate | Level 3      
Defined Benefit Plan Disclosure      
Total assets 1,000,000 0  
Non U S Pension And Postretirement Benefit Plans | Mortgage-backed securities      
Defined Benefit Plan Disclosure      
Total assets 22,000,000 1,000,000  
Non U S Pension And Postretirement Benefit Plans | Mortgage-backed securities | Level 1      
Defined Benefit Plan Disclosure      
Total assets 22,000,000 0  
Non U S Pension And Postretirement Benefit Plans | Mortgage-backed securities | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 1,000,000  
Non U S Pension And Postretirement Benefit Plans | Mortgage-backed securities | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | Annuity contracts      
Defined Benefit Plan Disclosure      
Total assets 42,000,000 33,000,000  
Non U S Pension And Postretirement Benefit Plans | Annuity contracts | Level 1      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | Annuity contracts | Level 2      
Defined Benefit Plan Disclosure      
Total assets 1,000,000 1,000,000  
Non U S Pension And Postretirement Benefit Plans | Annuity contracts | Level 3      
Defined Benefit Plan Disclosure      
Total assets 41,000,000 32,000,000 32,000,000
Non U S Pension And Postretirement Benefit Plans | Derivatives      
Defined Benefit Plan Disclosure      
Total assets   11,000,000  
Non U S Pension And Postretirement Benefit Plans | Derivatives | Level 1      
Defined Benefit Plan Disclosure      
Total assets   11,000,000  
Non U S Pension And Postretirement Benefit Plans | Derivatives | Level 2      
Defined Benefit Plan Disclosure      
Total assets   0  
Non U S Pension And Postretirement Benefit Plans | Derivatives | Level 3      
Defined Benefit Plan Disclosure      
Total assets   0  
Non U S Pension And Postretirement Benefit Plans | Other investments      
Defined Benefit Plan Disclosure      
Total assets 164,000,000 167,000,000  
Non U S Pension And Postretirement Benefit Plans | Other investments | Level 1      
Defined Benefit Plan Disclosure      
Total assets 1,000,000 1,000,000  
Non U S Pension And Postretirement Benefit Plans | Other investments | Level 2      
Defined Benefit Plan Disclosure      
Total assets 0 1,000,000  
Non U S Pension And Postretirement Benefit Plans | Other investments | Level 3      
Defined Benefit Plan Disclosure      
Total assets 163,000,000 165,000,000 202,000,000
Non U S Pension And Postretirement Benefit Plans | Total investments      
Defined Benefit Plan Disclosure      
Total assets 4,789,000,000 5,308,000,000  
Net investments at fair value 0 4,696,000,000  
Plan assets valued at NAV   5,000,000 11,000,000
Non U S Pension And Postretirement Benefit Plans | Total investments | Level 1      
Defined Benefit Plan Disclosure      
Total assets 3,080,000,000 3,422,000,000  
Net investments at fair value 3,153,000,000 3,531,000,000  
Non U S Pension And Postretirement Benefit Plans | Total investments | Level 2      
Defined Benefit Plan Disclosure      
Total assets 1,452,000,000 1,635,000,000  
Net investments at fair value 764,000,000 914,000,000  
Non U S Pension And Postretirement Benefit Plans | Total investments | Level 3      
Defined Benefit Plan Disclosure      
Total assets 257,000,000 251,000,000 $ 288,000,000
Net investments at fair value 257,000,000 251  
Non U S Pension And Postretirement Benefit Plans | Cash and short-term investments      
Defined Benefit Plan Disclosure      
Total assets 75,000,000 114,000,000  
Non U S Pension And Postretirement Benefit Plans | Cash and short-term investments | Level 1      
Defined Benefit Plan Disclosure      
Total assets 73,000,000 112,000,000  
Non U S Pension And Postretirement Benefit Plans | Cash and short-term investments | Level 2      
Defined Benefit Plan Disclosure      
Total assets 2,000,000 2,000,000  
Non U S Pension And Postretirement Benefit Plans | Cash and short-term investments | Level 3      
Defined Benefit Plan Disclosure      
Total assets 0 0  
Non U S Pension And Postretirement Benefit Plans | Other investment receivables      
Defined Benefit Plan Disclosure      
Plan assets valued at NAV 97,000,000 114,000,000  
Non U S Pension And Postretirement Benefit Plans | Securities      
Defined Benefit Plan Disclosure      
Plan assets valued at NAV 2,966,000,000 3,631,000,000  
U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Total net assets $ 12,137,000,000 $ 13,071,000,000  
Allocable interest (as a percent) 98.60% 99.90%  
U.S. Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Total net assets $ 166,000,000 $ 10,000,000  
Allocable interest (as a percent) 1.40% 0.01%