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
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Balances per Consolidated Balance Sheets:        
Cash and cash equivalents $ 1,093 $ 981    
Restricted cash 1,918 2,175    
Total cash, cash equivalents and restricted cash $ 3,011 $ 3,156 $ 2,422 $ 2,613