Activity related to the accruals for severance and medical costs and future lease payments on permanently grounded aircraft is as follows (in millions):
| Severance/ Benefit Costs |
Permanently Grounded Aircraft |
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|
Balance at December 31, 2013 |
$ | 91 | $ | 11 | ||||
|
Accrual |
199 | 102 | ||||||
|
Payments |
(181) | (11) | ||||||
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Balance at December 31, 2014 |
109 | 102 | ||||||
|
Accrual |
107 | 30 | ||||||
|
Payments |
(189) | (54) | ||||||
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Balance at December 31, 2015 |
27 | 78 | ||||||
|
Accrual and related adjustments |
37 | (17) | ||||||
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Payments |
(50) | (20) | ||||||
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Balance at December 31, 2016 |
$ | 14 | $ | 41 | ||||
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