Holding Company Only Financial Statements (Condensed Unconsolidated Statements of Cash Flow) (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
12 Months Ended |
Jun. 30, 2016 |
Jun. 30, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2013 |
Sep. 30, 2013 |
Jun. 30, 2013 |
Mar. 31, 2013 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Operating Activities |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net income (loss) |
$ 47
|
$ 46
|
$ 11
|
$ (28)
|
$ 26
|
$ (78)
|
$ 162
|
$ 14
|
$ 67
|
$ 23
|
$ 86
|
$ 78
|
$ 158
|
$ (69)
|
$ 267
|
| Adjustments to reconcile net income (loss) to net cash used in operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Change in other assets |
|
|
|
|
|
|
|
|
|
|
(58)
|
43
|
211
|
(33)
|
125
|
| Change in other liabilities |
|
|
|
|
|
|
|
|
|
|
31
|
6
|
(10)
|
12
|
(306)
|
| Net cash used in operating activities |
|
|
|
|
|
|
|
|
|
|
(5,153)
|
(5,046)
|
(9,547)
|
(8,145)
|
(1,562)
|
| Investing Activities |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net cash provided by investing activities |
|
|
|
|
|
|
|
|
|
|
5,334
|
2,937
|
5,885
|
7,509
|
5,534
|
| Net increase (decrease) in cash and cash equivalents |
|
|
|
|
|
|
|
|
|
|
(24)
|
110
|
72
|
(145)
|
(672)
|
| Beginning cash and cash equivalents |
|
|
|
|
|
281
|
|
|
|
953
|
208
|
136
|
136
|
281
|
953
|
| Ending cash and cash equivalents |
$ 184
|
$ 246
|
136
|
|
|
|
281
|
|
|
|
184
|
246
|
208
|
136
|
281
|
| Parent Company |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating Activities |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net income (loss) |
|
|
|
|
|
|
|
|
|
|
|
|
158
|
(69)
|
267
|
| Adjustments to reconcile net income (loss) to net cash used in operating activities: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Equity in (income) loss of subsidiaries |
|
|
|
|
|
|
|
|
|
|
|
|
(172)
|
63
|
(247)
|
| Stock-based compensation |
|
|
|
|
|
|
|
|
|
|
|
|
3
|
3
|
3
|
| Change in other assets |
|
|
|
|
|
|
|
|
|
|
|
|
(6)
|
(3)
|
(36)
|
| Provision for deferred tax benefit |
|
|
|
|
|
|
|
|
|
|
|
|
1
|
0
|
0
|
| Change in other liabilities |
|
|
|
|
|
|
|
|
|
|
|
|
9
|
4
|
7
|
| Net cash used in operating activities |
|
|
|
|
|
|
|
|
|
|
|
|
(7)
|
(2)
|
(6)
|
| Investing Activities |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Net change in investment in subsidiaries |
|
|
|
|
|
|
|
|
|
|
|
|
(2)
|
(2)
|
0
|
| Net cash provided by investing activities |
|
|
|
|
|
|
|
|
|
|
|
|
(2)
|
(2)
|
0
|
| Net increase (decrease) in cash and cash equivalents |
|
|
|
|
|
|
|
|
|
|
|
|
(9)
|
(4)
|
(6)
|
| Beginning cash and cash equivalents |
|
|
|
|
|
$ 50
|
|
|
|
$ 56
|
$ 37
|
$ 46
|
46
|
50
|
56
|
| Ending cash and cash equivalents |
|
|
$ 46
|
|
|
|
$ 50
|
|
|
|
|
|
$ 37
|
$ 46
|
$ 50
|