Acquisition of Orbital ATK Pro Forma Financial Information (Details 4) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares
Business Combinations [Abstract]
Business Acquisition, Pro Forma Revenue	$ 32,319
Business Acquisition, Pro Forma Net Income (Loss)	$ 3,417
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares	$ 19.57
Pro Forma Adjustments, Orbital ATK intercompany sales elimination	$ 80
Pro Forma Adjustments, Elimination of nonrecurring transaction costs	71
Pro Forma Adjustments, Additional depreciation expense, net of removal of historical depreciation	8
Pro Forma Adjustments, Additional amortization expense, net of removal of historical amortization expense	90
Pro Forma Adjustments, Elimination of Orbital ATK’s historical amortization of net actuarial losses and prior service credits and revised pension and other post-retirement costs	51
Income Tax Effects of Pro Forma Adjustments	$ (5)