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INVESTMENTS (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Jul. 17, 2018
Oct. 31, 2017
Schedule of Investments [Line Items]                  
Net unrealized gains on marketable equity securities         $ 451 $ 55      
Marketable securities:                  
Short-term investments in marketable securities         $ 1,981   $ 3,660    
Investments [Abstract]                  
Weighted average life of all fixed income investments, excluding the Company's investment in Ctrip convertible debt securities         1 year 5 months        
Investment in equity securities without readily determinable FV         $ 501   501    
Ctrip.com International, Ltd.                  
Schedule of Investments [Line Items]                  
Net unrealized gains on marketable equity securities         360 $ 55      
Meituan-Dianping                  
Schedule of Investments [Line Items]                  
Net unrealized gains on marketable equity securities         91        
Investments in Equity securities:                  
Cost Method Investments                 $ 450
Didi Chuxing                  
Investments [Abstract]                  
Investment in equity securities without readily determinable FV               $ 500  
Grab                  
Investments [Abstract]                  
Debt Securities, Available-for-sale, Noncurrent         200   200    
Short-term Investments                  
Marketable securities:                  
Cost         1,987   3,674    
Gross Unrealized Gains         1   0    
Gross Unrealized Losses         (7)   (14)    
Short-term investments in marketable securities         1,981   3,660    
Short-term Investments | International government securities                  
Debt securities:                  
Cost         218   314    
Gross Unrealized Gains         0   0    
Gross Unrealized Losses         0   0    
Fair Value         218   314    
Short-term Investments | U.S. government securities                  
Debt securities:                  
Cost         242   658    
Gross Unrealized Gains         0   0    
Gross Unrealized Losses         (1)   (2)    
Fair Value         241   656    
Short-term Investments | Corporate debt securities                  
Debt securities:                  
Cost         1,519   2,693    
Gross Unrealized Gains         1   0    
Gross Unrealized Losses         (6)   (12)    
Fair Value         1,514   2,681    
Short-term Investments | U.S. government agency securities                  
Debt securities:                  
Cost         1   1    
Gross Unrealized Gains         0   0    
Gross Unrealized Losses         0   0    
Fair Value         1   1    
Short-term Investments | Commercial paper                  
Debt securities:                  
Cost         4   7    
Gross Unrealized Gains         0   0    
Gross Unrealized Losses         0   0    
Fair Value         4   7    
Short-term Investments | Time deposits and certificates of deposit                  
Debt securities:                  
Cost         3   1    
Gross Unrealized Gains         0   0    
Gross Unrealized Losses         0   0    
Fair Value         3   1    
Long-term Investments                  
Investments in Equity securities:                  
Cost         1,105   1,105    
Gross Unrealized Gains         383   3    
Gross Unrealized Losses         (1)   (72)    
Fair Value         1,487   1,036    
Marketable securities:                  
Cost         7,303   7,921    
Gross Unrealized Gains         469   10    
Gross Unrealized Losses         (28)   (224)    
Long-term investments         7,744   7,707    
Long-term Investments | Ctrip.com International, Ltd.                  
Investments in Equity securities:                  
Cost         655        
Long-term Investments | International government securities                  
Debt securities:                  
Cost         879   797    
Gross Unrealized Gains         5   3    
Gross Unrealized Losses         0   0    
Fair Value         884   800    
Long-term Investments | U.S. government securities                  
Debt securities:                  
Cost         250   299    
Gross Unrealized Gains         0   0    
Gross Unrealized Losses         (4)   (6)    
Fair Value         246   293    
Long-term Investments | Corporate debt securities                  
Debt securities:                  
Cost         3,794   4,445    
Gross Unrealized Gains         12   4    
Gross Unrealized Losses         (23)   (48)    
Fair Value         3,783   4,401    
Long-term Investments | Ctrip convertible debt securities | Ctrip.com International, Ltd.                  
Debt securities:                  
Cost $ 25 $ 500 $ 250 $ 500 1,275   1,275    
Gross Unrealized Gains         69   0    
Gross Unrealized Losses         0   (98)    
Fair Value         $ 1,344   $ 1,177    
Investments [Abstract]                  
Debt investment term 6 years 10 years 5 years 5 years