Income Taxes (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets (Table Amounts)
Retirement benefits	$ 1,308	$ 2,710
Provisions for accrued liabilities	646	675
Stock-based compensation	109	146
Other	144	151
Gross deferred tax assets	2,207	3,682
Less valuation allowance	(55)	(52)
Net deferred tax assets	2,152	3,630
Deferred Tax Liabilities (Table Amounts)
Goodwill	806	804
Property, plant, and equipment, net	348	376
Contract accounting differences	134	199
Deferred Tax Liabilities, Other	50	135
Gross deferred tax liabilities	1,338	1,514
Total net deferred tax assets	$ 814	$ 2,116