Subsequent Events (Details) - USD ($)
$ in Millions |
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6 Months Ended |
12 Months Ended |
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Jul. 29, 2016 |
Jul. 14, 2016 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Jul. 11, 2016 |
| Subsequent Event [Line Items] |
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| Long-term debt |
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$ 247
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$ 247
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$ 331
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| Increase (decrease) in other liabilities |
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31
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$ 6
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(10)
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12
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$ (306)
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| Preferred units |
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$ 267
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$ 267
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$ 267
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| Subsequent Event |
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| Subsequent Event [Line Items] |
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| Increase (decrease) in Long-term Debt |
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$ 245
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| Increase (decrease) in other liabilities |
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$ (34)
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| Preferred units |
$ 267
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| Increase (decrease) in stockholders' equity |
(371)
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| Subsequent Event | Preferred Stock |
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| Subsequent Event [Line Items] |
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| Increase (decrease) in stockholders' equity |
(267)
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| Subsequent Event | Additional Paid-in Capital |
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| Subsequent Event [Line Items] |
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| Increase (decrease) in stockholders' equity |
$ (104)
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| Senior Notes | Debt Offering | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Long-term debt |
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$ 250
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| Long-term debt, interest rate (as a percent) |
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6.125%
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| Subordinated Debt | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Payment of trust preferred securities |
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$ 34
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