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FAIR VALUE MEASUREMENTS (Details - Assets measured at fair value on a non-recurring basis at the time of impairment and the related impairment charges recorded during the periods presented) - Fair value on a non-recurring basis - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Impairment Charges $ 52 $ 34 $ 127 $ 124  
Other investments          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Impairment Charges 7 0 65 89  
Other assets          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Impairment Charges 45 $ 34 62 $ 35  
Level 1 | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 0   0   $ 0
Level 1 | Other investments          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 0   0   0
Level 1 | Other assets          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 0   0   0
Level 2 | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 0   0   0
Level 2 | Other investments          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 0   0   0
Level 2 | Other assets          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 0   0   0
Level 3 | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 254   254   326
Level 3 | Other investments          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 253   253   315
Level 3 | Other assets          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 1   1   11
Total Fair Value | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 254   254   326
Total Fair Value | Other investments          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value 253   253   315
Total Fair Value | Other assets          
Fair Value Assets Measured on Nonrecurring Basis [Line Items]          
Fair Value $ 1   $ 1   $ 11