Basis Of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Basis of Presentation [Line Items]
Change in diluted earnings per share due to net favorable/(unfavorable) cumulative catch-up adjustments	$ 0.04	$ (0.09)
Increase/(Decrease) in Earnings from operations due to change in accounting estimate	$ 32	$ (84)

Changes in estimated revenues, cost of sales and the related effect on operating income are recognized using a cumulative catch-up adjustment which recognizes in the current period the cumulative effect of the changes on current and prior periods based on a contract’s percent complete

No definition available.

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Balance Type:	credit
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