Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS AND RESTRICTED CASH - Cash Details (Details)

v3.19.2
INVESTMENTS AND RESTRICTED CASH - Cash Details (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]        
Cash and cash equivalents $ 4,072 $ 4,225 $ 4,214  
Restricted cash 144 142 277  
Total cash, cash equivalents and restricted cash $ 4,216 $ 4,367 $ 4,491 $ 3,769