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STOCK-BASED COMPENSATION - RSUs and PSUs, Other Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-Based Compensation      
Stock-based compensation cost, unrecognized, related to non-vested awards $ 934 $ 871  
RSUs and PSUs      
Stock-Based Compensation      
Tax benefits realized in connection with vesting and release of awards $ 118 $ 228 $ 222
Restricted Stock Units      
Stock-Based Compensation      
Remaining weighted-average contractual term 3 years 3 years 3 years
Fair value of stock units granted $ 557 $ 606 $ 434
Fair value of stock units vested and released 323 583 378
Stock-based compensation cost, unrecognized, related to non-vested awards 814 800 754
Cash received from employees as a result of vesting and release of awards $ 0 0 0
Restricted Stock Units | Minimum      
Stock-Based Compensation      
Vesting period 1 year    
Restricted Stock Units | Maximum      
Stock-Based Compensation      
Vesting period 5 years    
Performance Share Units      
Stock-Based Compensation      
Vesting period 3 years    
Fair value of stock units granted $ 138 174 257
Fair value of stock units vested and released $ 81 $ 156 $ 161