Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating Activities
Net earnings (loss)	$ 447	$ 400
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	136	126
Amortization of purchased intangibles	41	35
Amortization of debt issuance costs	5	2
Provision for doubtful accounts	(2)	(5)
Stock-based compensation	16	19
Deferred income taxes	(7)	42
Loss (gain) on investments in marketable securities	(3)	(6)
Asset impairments	13
Change in
Accounts Receivable	(164)	(223)
Contract assets	(63)	(197)
Inventoried costs	(5)	(14)
Prepaid expenses and other assets	(60)	(56)
Accounts payable and accruals	315	147
Retiree benefits	(183)	56
Other non-cash transactions, net	5	4
Net cash provided by (used in) operating activities	491	330
Investing Activities
Capital expenditure additions	(220)	(349)
Grant proceeds for capital expenditures	17	71
Acquisitions of businesses, net of cash received	(377)	(195)
Other investing activities, net	(6)	3
Net cash provided by (used in) investing activities	(586)	(470)
Financing Activities
Proceeds from issuance of long-term debt	1,000
Proceeds from revolving credit facility borrowings	385	5,048
Repayment of revolving credit facility borrowings	(385)	(4,784)
Debt issuance costs	(13)
Dividends paid	(126)	(107)
Repurchases of common stock	(84)	(202)
Employee taxes on certain share-based payment arrangements	(13)	(23)
Net cash provided by (used in) financing activities	764	(68)
Change in cash and cash equivalents	669	(208)
Cash and cash equivalents, beginning of period	75	240
Cash and cash equivalents, end of period	744	32
Supplemental Cash Flow Disclosure
Cash paid for income taxes	106	124
Cash paid for interest	33	40
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	$ 8	12
Accrued repurchases of common stock		$ 2