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Debt (Recourse Debt Carrying Amount and Terms) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Recourse Debt Total $ 4,671 $ 4,966
Recourse Debt Current 0 0
Recourse Debt Non Current $ 4,671 4,966
8.00% Senior Unsecured Note Due 2017    
Debt Instrument [Line Items]    
Recourse Debt Total   $ 181
8.00% Senior Unsecured Note Due 2017 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 8.00% 8.00%
Senior Unsecured Note LIBOR plus 3% due 2019    
Debt Instrument [Line Items]    
Recourse Debt Total   $ 775
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    
Debt Instrument [Line Items]    
Recourse Debt Total   $ 469
8.00% Senior Unsecured Note Due 2020 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 8.00% 8.00%
7.38% Senior Unsecured Note Due 2021    
Debt Instrument [Line Items]    
Recourse Debt Total   $ 1,000
7.38% Senior Unsecured Note Due 2021 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 7.38% 7.38%
4.88% Senior Unsecured Note Due 2023    
Debt Instrument [Line Items]    
Recourse Debt Total   $ 750
4.88% Senior Unsecured Note Due 2023 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 4.88% 4.88%
5.50% Senior Unsecured Note Due 2024    
Debt Instrument [Line Items]    
Recourse Debt Total   $ 750
5.50% Senior Unsecured Note Due 2024 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 5.50% 5.50%
5.50% Unsecured senior notes due 2025 [Domain] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 5.50% 5.50%
Recourse Debt Total   $ 575
6.00% senior notes due 2026 [Domain] | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 6.00% 6.00%
Recourse Debt Total   $ 0
6.75% Term Convertible Trust Securities Due 2029    
Debt Instrument [Line Items]    
Recourse Debt Total $ 517 $ 517
6.75% Term Convertible Trust Securities Due 2029 | Recourse Debt    
Debt Instrument [Line Items]    
Interest Rate 6.75% 6.75%
Unamortized (discounts)/premiums & debt issuance (costs), net    
Debt Instrument [Line Items]    
Recourse Debt Total $ (45) $ (51)