Quarterly report pursuant to Section 13 or 15(d)

Supplemental Guarantor Information - Condensed Consolidating Cash Flows - Balances per Condensed Consolidating Balance Sheet (Details)

v3.19.2
Supplemental Guarantor Information - Condensed Consolidating Cash Flows - Balances per Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents $ 1,016 $ 0    
Restricted cash 596 1,541    
Total cash, cash equivalents and restricted cash 1,612 1,541 $ 1,521 $ 1,589
Parent Issuer [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 1,009 0    
Restricted cash 0 779    
Total cash, cash equivalents and restricted cash 1,009 779 663 1,033
Guarantors [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 7 0    
Restricted cash 0 6    
Total cash, cash equivalents and restricted cash 7 6 12 12
Non-Guarantors [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 596 756    
Total cash, cash equivalents and restricted cash 596 756 846 544
Eliminations [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Total cash, cash equivalents and restricted cash $ 0 $ 0 $ 0 $ 0