Other Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Salaries and wages		$ 786	$ 693
Fair value of cash flow hedges		180	521
Workers' compensation		320	337
Retirement benefits		295	303
Other	[1]	1,317	1,331
Total other current liabilities		2,898	3,185
Retirement benefits		4,408	4,393
Customer deposits on commercial contracts		814	719
Deferred income taxes		244	183
Other	[2]	1,066	1,138
Total other liabilities		$ 6,532	$ 6,433

[1] Consists primarily of dividends payable, taxes payable, environmental remediation reserves, warranty reserves, deferred revenue and supplier contributions in the Aerospace group, liabilities of discontinued operations, and insurance-related costs.

[2] Consists primarily of warranty reserves, workers’ compensation liabilities and liabilities of discontinued operations.