Income Taxes Income Tax Examination (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Closure of IRS audit of Rockwell Subsidiary Tax Year 2014 [Member]
Income Tax Examination [Line Items]
Tax Settlement Gain (Loss) Noncash	$ 40
Reversal of Indemnity Asset [Member]
Income Tax Examination [Line Items]
Tax Settlement Gain (Loss) Noncash	$ (23)