Components of net interest expense were as follows: | | | | | | | | | | | | | | | | | | | Successor | | | Predecessor | | Twelve Months Ended December 31, 2016 | | Twelve Months Ended December 31, 2015 | | September 1, 2014 through December 31, 2014 | | | January 1, 2014 through August 31, 2014 | | (in millions) | Interest expense | $ | 152 |
| | $ | 64 |
| | $ | 8 |
| | | $ | 5 |
| Amortization of deferred financing fees | 11 |
| | 4 |
| | 2 |
| | | — |
| Interest income | (3 | ) | | (2 | ) | | — |
| | | — |
| Interest expense, net | $ | 160 |
| | $ | 66 |
| | $ | 10 |
| | | $ | 5 |
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