Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Supplemental Guarantor Information - Condensed Consolidating Cash Flows - Balances per Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents $ 0 $ 0    
Restricted cash 1,541 1,589    
Total cash, cash equivalents and restricted cash 1,541 1,589 $ 605 $ 434
Parent Issuer [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 779 1,033    
Total cash, cash equivalents and restricted cash 779 1,033 234 110
Guarantors [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 6 12    
Total cash, cash equivalents and restricted cash 6 12 13 135
Non-Guarantors [Member]        
Balances per Consolidated Balance Sheet:        
Cash and cash equivalents 0 0    
Restricted cash 756 544    
Total cash, cash equivalents and restricted cash 756 544 358 189
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