Commitments and Contingencies (Details) (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Environmental Matters
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 308
High-end of the range of reasonably possible future costs for environmental remediation sites	748
Accrual for Environmental Remediation Costs	336
Environmental liabilities recorded in other current liabilities	84
Environmental liabilities recorded in other non-current liabilities	252
Deferred inventoried costs	55
Deferred non-current assets	142
Financial Arrangements [Abstract]
Unused standby letters of credit	184
Bank guarantees	169
Surety bonds outstanding	109
Operating leases
Rental expense for operating leases, excluding discontinued operations and net of immaterial amounts of sublease rental income	84	105
Spin-off of Shipbuilding Business [Abstract]
Economic Development Revenue Bonds, outstanding	$ 84