Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Global pension contributions			$ 89	$ 72
Contributions - Defined benefit plans	$ 10	$ 13	89	72
Contributions - Defined contribution plans	134	97	421	296
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Global pension contributions		0	25	0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	88	94	264	280
Interest cost	334	274	1,014	831
Expected return on plan assets	605	558	1,820	1,683
Amortization of prior service cost (credit)	4	(11)	13	(31)
Recognized actuarial net loss (gain)	(66)	(100)	(172)	(302)
Net settlement and curtailment (loss) gain	96	(3)	87	0
Total net periodic benefit (income) cost	(209)	(98)	(444)	(301)
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(425)
Net settlement and curtailment (loss) gain	98
Total net periodic benefit (income) cost	10
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	2	1
Interest cost	7	7	23	19
Expected return on plan assets	0	0	1	0
Amortization of prior service cost (credit)	(10)	0	(32)	(2)
Recognized actuarial net loss (gain)	3	3	9	7
Net settlement and curtailment (loss) gain	0	0	0	0
Total net periodic benefit (income) cost	(6)	$ 4	(17)	$ 11
Rockwell Collins Defined Contribution Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions - Defined contribution plans			$ 98
Benefit obligation gain [Member] | Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	180
Remeasurement loss [Member] | Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	$ (605)