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Debt (Recourse Debt Carrying Amount and Terms) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Recourse Debt Total $ 4,630 $ 4,671
Recourse Debt Current (5) 0
Recourse Debt Non Current $ 4,625 $ 4,671
8.00% Senior Unsecured Note Due 2017 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   8.00%
Senior Unsecured Note LIBOR plus 3% due 2019 | Recourse Debt | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.00% 3.00%
8.00% Senior Unsecured Note Due 2020 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 8.00% 8.00%
7.375% Senior Notes Due 2021 [Member] [Member] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 7.38%  
Revolving Credit Facility [Member] | Recourse Debt | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00% 2.00%
Senior Secured Term Loan due 2022 [Member] | Recourse Debt | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00% 2.00%
4.88% Senior Unsecured Note Due 2023 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   4.88%
5.50% Senior Unsecured Note Due 2024 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   5.50%
5.50% Unsecured senior notes due 2025 [Domain] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   5.50%
6.00% senior notes due 2026 [Domain] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   6.00%
6.75% Term Convertible Trust Securities Due 2029 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 6.75% 6.75%
Recourse Debt Total $ 0 $ 517
Unamortized (discount) premium & debt issuance (costs), net    
Debt Instrument [Line Items]    
Recourse Debt Total (40)  
Parent Company [Member]    
Debt Instrument [Line Items]    
Recourse Debt Total $ 4,630  
Parent Company [Member] | 8.00% Senior Unsecured Note Due 2017 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   8.00%
Parent Company [Member] | Senior Unsecured Note LIBOR plus 3% due 2019 | Recourse Debt | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.00% 3.00%
Recourse Debt Total $ 0 $ 240
Parent Company [Member] | 8.00% Senior Unsecured Note Due 2020 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   8.00%
Parent Company [Member] | 8.00% Senior Unsecured Note Due 2020 | Recourse Debt | LIBOR    
Debt Instrument [Line Items]    
Recourse Debt Total 228 $ 469
Parent Company [Member] | 7.375% Senior Notes Due 2021 [Member] [Member] | Recourse Debt    
Debt Instrument [Line Items]    
Recourse Debt Total 690 966
Parent Company [Member] | Revolving Credit Facility [Member] | Recourse Debt    
Debt Instrument [Line Items]    
Recourse Debt Total 207 0
Parent Company [Member] | Senior Secured Term Loan due 2022 [Member] | Recourse Debt    
Debt Instrument [Line Items]    
Recourse Debt Total $ 521 0
Parent Company [Member] | 4.875% Senior Notes Due 2023 [Member] [Member] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 4.88%  
Recourse Debt Total $ 713 $ 713
Parent Company [Member] | 4.88% Senior Unsecured Note Due 2023 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate   4.88%
Parent Company [Member] | 5.50% Senior Unsecured Note Due 2024 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 5.50% 5.50%
Recourse Debt Total $ 738 $ 738
Parent Company [Member] | 5.50% Unsecured senior notes due 2025 [Domain] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 5.50% 5.50%
Recourse Debt Total $ 573 $ 573
Parent Company [Member] | 6.00% senior notes due 2026 [Domain] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 6.00% 6.00%
Recourse Debt Total $ 500 $ 500
Parent Company [Member] | 5.125% Senior Notes Due 2027 [Member] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 5.13%  
Recourse Debt Total $ 500 0
Parent Company [Member] | Unamortized (discount) premium & debt issuance (costs), net    
Debt Instrument [Line Items]    
Recourse Debt Total $ (40) $ (45)