Commitments and Contingencies (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Environmental Matters
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 310		$ 310
High-end of the range of reasonably possible future costs for environmental remediation sites	737		737
Accrual for Environmental Remediation Costs	335		335
Environmental liabilities recorded in other current liabilities	87		87
Environmental liabilities recorded in other non-current liabilities	248		248
Deferred inventoried costs	57		57
Deferred non-current assets	139		139
Financial Arrangements [Abstract]
Unused standby letters of credit	207		207
Bank guarantees	225		225
Surety bonds outstanding	93		93
Operating leases
Rental expense for operating leases, excluding discontinued operations and net of immaterial amounts of sublease rental income	80	111	260	326
Spin-off of Shipbuilding Business [Abstract]
Economic Development Revenue Bonds, outstanding	$ 84		$ 84
Guarantee, year of maturity	2024		2024