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Guarantor and Non-Guarantor Consolidating Financial Statements Cash and cash equivalents, program cash and restricted cash (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents $ 686 $ 615    
Program cash 211 115    
Restricted Cash and Cash Equivalents 3 5    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 900 735 $ 901 $ 720
Non-Guarantor Subsidiaries        
Cash and cash equivalents 673 601    
Program cash 211 115    
Restricted Cash and Cash Equivalents 3 5    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 887 $ 721 $ 883 $ 705