Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions			$ 79	$ 59
Contributions - Defined benefit plans	$ 47	$ 22	79	59
Contributions - Defined contribution plans	134	105	287	199
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	25	0	25	0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	89	93	176	186
Interest cost	340	278	680	557
Expected return on plan assets	608	562	1,215	1,125
Amortization of prior service cost (credit)	4	(10)	9	(20)
Recognized actuarial net loss (gain)	(53)	(101)	(106)	(202)
Net settlement and curtailment (loss) gain	(1)	2	(9)	3
Total net periodic benefit (income) cost	(121)	(102)	(235)	(203)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0	2	1
Interest cost	8	6	16	12
Expected return on plan assets	0	0	1	0
Amortization of prior service cost (credit)	(11)	(1)	(22)	(2)
Recognized actuarial net loss (gain)	3	2	6	4
Net settlement and curtailment (loss) gain	0	0	0	0
Total net periodic benefit (income) cost	$ (5)	$ 3	(11)	$ 7
Rockwell Collins Defined Contribution Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions - Defined contribution plans			$ 65