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Costs and Estimated Earnings on Uncompleted Contracts (Tables) | 6 Months Ended
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Jun. 30, 2016
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Costs and Estimated Earnings on Uncompleted Contracts | Costs and estimated earnings on uncompleted contracts consist of (in millions):
|  | June 30, 2016 |  |  | December 31, 2015 |
Costs incurred on uncompleted contracts |  | $ | 7,937 |  |  | $ | 9,082 |
Estimated earnings |  |  | 3,700 |  |  |  | 4,080 |
|  |  | 11,637 |  |  |  | 13,162 |
Less: Billings to date |  |  | 11,500 |  |  |  | 12,697 |
|  | $ | 137 |  |  | $ | 465 |
Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 790 |  |  | $ | 1,250 |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (653 | ) |  |  | (785 | )
|  | $ | 137 |  |  | $ | 465 |

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