Commitments and Contingencies (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Environmental Matters
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 312		$ 312
High-end of the range of reasonably possible future costs for environmental remediation sites	732		732
Accrual for Environmental Remediation Costs	338		338
Environmental liabilities recorded in other current liabilities	86		86
Environmental liabilities recorded in other non-current liabilities	252		252
Deferred inventoried costs	56		56
Deferred non-current assets	142		142
Financial Arrangements [Abstract]
Unused standby letters of credit	205		205
Bank guarantees	229		229
Surety bonds outstanding	99		99
Operating leases
Rental expense for operating leases, excluding discontinued operations and net of immaterial amounts of sublease rental income	97	110	181	215
Spin-off of Shipbuilding Business [Abstract]
Economic Development Revenue Bonds, outstanding	$ 84		$ 84
Guarantee Maturity	2024		2024