Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net earnings (loss)	$ 225	$ 246
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	92	83
Amortization of purchased intangibles	26	23
Amortization of debt issuance costs	3	1
Provision for doubtful accounts	6	(2)
Stock-based compensation	13	12
Deferred income taxes	21	30
Loss (gain) on investments in marketable securities	5	(4)
Change in
Accounts Receivable	(167)	(301)
Contract assets	(63)	(238)
Inventoried costs	(13)	(1)
Prepaid expenses and other assets	(4)	(39)
Accounts payable and accruals	172	107
Retiree benefits	(50)	46
Other non-cash transactions, net	3	4
Net cash provided by (used in) operating activities	269	(33)
Investing Activities
Capital expenditure additions	(150)	(234)
Grant proceeds for capital expenditures	9	69
Acquisitions of businesses, net of cash received	(378)	(196)
Net cash provided by (used in) investing activities	(519)	(361)
Financing Activities
Proceeds from issuance of long-term debt	1,000
Proceeds from revolving credit facility borrowings	385	3,286
Repayment of revolving credit facility borrowings	(385)	(2,872)
Debt issuance costs	(13)
Dividends paid	(84)	(72)
Repurchases of common stock	(84)	(136)
Employee taxes on certain share-based payment arrangements	(13)	(23)
Net cash provided by (used in) financing activities	806	183
Change in cash and cash equivalents	556	(211)
Cash and cash equivalents, beginning of period	75	240
Cash and cash equivalents, end of period	631	29
Supplemental Cash Flow Disclosure
Cash paid for income taxes	23	89
Cash paid for interest	32	35
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	$ 5	$ 9