Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Cash Flows - Balances per Consolidated Balance Sheets

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Consolidated Statements of Cash Flows - Balances per Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Balances per Consolidated Balance Sheets:        
Cash and cash equivalents $ 2,279 $ 981    
Current restricted cash 1,161 2,175    
Total cash, cash equivalents and restricted cash $ 3,440 $ 3,156 $ 3,271 $ 2,613