Condensed Consolidated Statements Of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Sales and service revenues
Sales and service revenues	$ 2,027	$ 2,188	$ 4,290	$ 4,268
Cost of sales and service revenues
Income (loss) from operating investments, net	7	5	13	9
General and administrative expenses	214	184	428	355
Operating income (loss)	57	175	272	336
Other income (expense)
Interest expense	(25)	(18)	(41)	(34)
Non-operating retirement benefit (expense)	30	2	60	5
Other, net	3	5	(10)	6
Earnings (loss) before income taxes	65	164	281	313
Federal and foreign income taxes	12	36	56	67
Net earnings (loss)	$ 53	$ 128	$ 225	$ 246
Basic earnings (loss) per share (in dollars per share)	$ 1.30	$ 3.07	$ 5.54	$ 5.91
Weighted-average common shares outstanding (in shares)	40.7	41.7	40.6	41.6
Diluted earnings (loss) per share	$ 1.30	$ 3.07	$ 5.54	$ 5.91
Weighted-average diluted shares outstanding (in shares)	40.7	41.7	40.6	41.6
Dividends declared per share	$ 1.03	$ 0.86	$ 2.06	$ 1.72
Other comprehensive income (loss)
Change in unamortized benefit plan costs	$ 23	$ 24	$ 46	$ 49
Other	1		(1)
Tax benefit (expense) for items of other comprehensive income	(6)	(6)	(12)	(12)
Other comprehensive income (loss), net of tax	18	18	33	37
Comprehensive income (loss)	71	146	258	283
Product [Member]
Sales and service revenues
Sales and service revenues	1,420	1,520	3,044	3,010
Cost of sales and service revenues
Cost of sales and service revenues	1,253	1,250	2,543	2,508
Service [Member]
Sales and service revenues
Sales and service revenues	607	668	1,246	1,258
Cost of sales and service revenues
Cost of sales and service revenues	$ 510	$ 584	$ 1,060	$ 1,078