Income Taxes Income tax expense benefit reconciliation (Details) - USD ($)
$ in Millions |
2 Months Ended |
10 Months Ended |
12 Months Ended |
Dec. 31, 2014 |
Oct. 24, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Income Tax Disclosure [Abstract] |
|
|
|
|
| Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate |
$ (21)
|
$ 603
|
$ (50)
|
$ (25)
|
| Income Tax Reconciliation, State and Local Income Taxes |
0
|
0
|
0
|
0
|
| Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate |
0
|
1
|
(6)
|
(3)
|
| Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential |
4
|
(1)
|
(4)
|
(1)
|
| Branch accounting effect |
(23)
|
(22)
|
(17)
|
7
|
| Payments for Repurchase of Common Stock for Employee Tax Withholding Obligations |
0
|
0
|
3
|
3
|
| Valuation Allowance, Amount |
(38)
|
(695)
|
(76)
|
(33)
|
| Reorganization and fresh start |
0
|
101
|
0
|
0
|
| Income Tax Reconciliation, Other Adjustments |
1
|
27
|
(1)
|
3
|
| Bankruptcy costs |
1
|
40
|
0
|
0
|
| Effective Income Tax Rate Reconciliation, Change in Permanent Reinvestment Assertion |
(5)
|
(20)
|
0
|
0
|
| reserves for uncertain tax positions |
5
|
2
|
17
|
(4)
|
| Income Tax Expense (Benefit) |
$ 0
|
$ 36
|
$ 18
|
$ 13
|