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Summary of Significant Accounting Policies (Details 4) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in Accounting Estimate [Line Items]
Operating Income (Loss)	$ 762us-gaap_OperatingIncomeLoss	$ 769us-gaap_OperatingIncomeLoss	$ 820us-gaap_OperatingIncomeLoss	$ 845us-gaap_OperatingIncomeLoss	$ 768us-gaap_OperatingIncomeLoss	$ 790us-gaap_OperatingIncomeLoss	$ 806us-gaap_OperatingIncomeLoss	$ 759us-gaap_OperatingIncomeLoss	$ 3,196us-gaap_OperatingIncomeLoss	$ 3,123us-gaap_OperatingIncomeLoss	$ 3,130us-gaap_OperatingIncomeLoss
Earnings Per Share, Diluted	$ 2.48us-gaap_EarningsPerShareDiluted	$ 2.26us-gaap_EarningsPerShareDiluted	$ 2.37us-gaap_EarningsPerShareDiluted	$ 2.63us-gaap_EarningsPerShareDiluted	$ 2.12us-gaap_EarningsPerShareDiluted	$ 2.14us-gaap_EarningsPerShareDiluted	$ 2.05us-gaap_EarningsPerShareDiluted	$ 2.03us-gaap_EarningsPerShareDiluted	$ 9.75us-gaap_EarningsPerShareDiluted	$ 8.35us-gaap_EarningsPerShareDiluted	$ 7.81us-gaap_EarningsPerShareDiluted
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating Income (Loss)									$ 664	$ 753	$ 985
Earnings Per Share, Diluted									$ 2.04	$ 2.09	$ 2.53

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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