Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS AND RESTRICTED CASH - Cash Details (Details)

v3.19.1
INVESTMENTS AND RESTRICTED CASH - Cash Details (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]        
Cash and cash equivalents $ 4,399 $ 4,225 $ 3,544  
Restricted cash 143 142 282  
Total cash, cash equivalents and restricted cash $ 4,542 $ 4,367 $ 3,826 $ 3,769