Income Taxes, Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets [Abstract]
Inventoried costs	$ 63	$ 56
Compensation and benefits	152	147
Pension and postretirement benefits	415	354
Loss carryforwards	18	12
Tax credit carryforwards	6	6
Other	89	79
Deferred tax assets	743	654
Less: valuation allowance	(12)	(9)
Deferred tax assets, net of valuation allowance	731	645
Deferred tax liabilities [Abstract]
Goodwill and other intangible assets	(752)	(675)
Income recognition on contracts in process	(63)	(36)
Property, plant and equipment	(96)	(94)
Other	(54)	(56)
Deferred tax liabilities	(965)	(861)
Total deferred tax liabilities, net of valuation allowance	$ (234)	$ (216)