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

v3.8.0.1
Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows - Balances per Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balances per Consolidated Balance Sheets:        
Cash and cash equivalents $ 0 $ 0    
Restricted cash 1,589 605    
Total cash, cash equivalents and restricted cash 1,589 605 $ 434 $ 989
Parent Issuer [Member]        
Balances per Consolidated Balance Sheets:        
Cash and cash equivalents 0 0    
Restricted cash 1,033 234    
Total cash, cash equivalents and restricted cash 1,033 234 110 222
Guarantors [Member]        
Balances per Consolidated Balance Sheets:        
Cash and cash equivalents 0 0    
Restricted cash 12 13    
Total cash, cash equivalents and restricted cash 12 13 135 154
Non-Guarantor [Member]        
Balances per Consolidated Balance Sheets:        
Cash and cash equivalents 0 0    
Restricted cash 544 358    
Total cash, cash equivalents and restricted cash 544 358 189 613
Eliminations [Member]        
Balances per Consolidated Balance Sheets:        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Total cash, cash equivalents and restricted cash $ 0 $ 0 $ 0 $ 0