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

v3.8.0.1
Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows - Balances per Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents $ 0 $ 0    
Restricted cash 1,477 1,589    
Total cash, cash equivalents and restricted cash 1,477 1,589 $ 1,756 $ 605
Parent Issuer [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 903 1,033    
Total cash, cash equivalents and restricted cash 903 1,033 212 234
Guarantors [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 13 12    
Total cash, cash equivalents and restricted cash 13 12 13 13
Non-Guarantor [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 561 544    
Total cash, cash equivalents and restricted cash 561 544 1,531 358
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