Annual report pursuant to Section 13 and 15(d)

CASH AND INVESTMENTS - Cash Details (Details)

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CASH AND INVESTMENTS - Cash Details (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]        
Cash and cash equivalents $ 4,225 $ 3,320 $ 3,476  
Restricted cash 142 449 445  
Total cash, cash equivalents and restricted cash $ 4,367 $ 3,769 $ 3,921 $ 3,172