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Costs and Estimated Earnings on Uncompleted Contracts (Tables) | 6 Months Ended
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Jun. 30, 2013
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Costs and Estimated Earnings on Uncompleted Contracts | Costs and estimated earnings on uncompleted contracts consist of (in millions):
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |
Costs incurred on uncompleted contracts |  | $ | 6,942 |  |  | $ | 5,731 |
Estimated earnings |  |  | 3,527 |  |  |  | 3,160 |
|  |  | 10,469 |  |  |  | 8,891 |
Less: Billings to date |  |  | 10,180 |  |  |  | 8,855 |
|  | $ | 289 |  |  | $ | 36 |
Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 1,448 |  |  | $ | 1,225 |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (1,159 | ) |  |  | (1,189 | )
|  | $ | 289 |  |  | $ | 36 |

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