Employee Benefit Plans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	$ 32,000,000	$ 37,000,000
Contributions - Defined benefit plans	32,000,000	37,000,000
Contributions - Defined contribution plans	153,000,000	94,000,000
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	0	0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	87,000,000	93,000,000
Interest cost	340,000,000	279,000,000
Expected return on plan assets	607,000,000	563,000,000
Amortization of prior service cost (credit)	5,000,000	(10,000,000)
Recognized actuarial net loss (gain)	(53,000,000)	(101,000,000)
Net settlement and curtailment (loss) gain	(8,000,000)	1,000,000
Total net periodic benefit (income) cost	(114,000,000)	(101,000,000)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,000,000	1,000,000
Interest cost	8,000,000	6,000,000
Expected return on plan assets	1,000,000	0
Amortization of prior service cost (credit)	(11,000,000)	(1,000,000)
Recognized actuarial net loss (gain)	3,000,000	2,000,000
Net settlement and curtailment (loss) gain	0	0
Total net periodic benefit (income) cost	(6,000,000)	$ 4,000,000
Rockwell Collins Defined Contribution Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions - Defined contribution plans	$ 35,000,000