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Costs and Estimated Earnings on Uncompleted Contracts (Tables) | 12 Months Ended
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Dec. 31, 2015
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Costs and Estimated Earnings on Uncompleted Contracts | Costs and estimated earnings on uncompleted contracts consist of (in millions):
|  | December 31, |
|  | 2015 |  |  | 2014 |
Costs incurred on uncompleted contracts |  | $ | 9,082 |  |  | $ | 10,442 |
Estimated earnings |  |  | 4,080 |  |  |  | 4,699 |
|  |  | 13,162 |  |  |  | 15,141 |
Less: Billings to date on uncompleted contracts |  |  | 12,697 |  |  |  | 15,038 |
|  | $ | 465 |  |  | $ | 103 |
Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 1,250 |  |  | $ | 1,878 |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (785 | ) |  |  | (1,775 | )
|  | $ | 465 |  |  | $ | 103 |

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