Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net earnings (loss)	$ 424	$ 447
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	154	136
Amortization of purchased intangibles	48	41
Amortization of debt issuance costs	6	5
Provision for doubtful accounts		(2)
Stock-based compensation	19	16
Deferred income taxes	74	(7)
Loss (gain) on investments in marketable securities	(12)	(3)
Asset impairments		13
Change in
Accounts Receivable	52	(164)
Contract assets	(179)	(63)
Inventoried costs	(7)	(5)
Prepaid expenses and other assets	(116)	(60)
Accounts payable and accruals	93	315
Retiree benefits	(73)	(183)
Other non-cash transactions, net	6	5
Net cash provided by (used in) operating activities	489	491
Investing Activities
Capital expenditure additions	(216)	(220)
Grant proceeds for capital expenditures	11	17
Acquisitions of businesses, net of cash received	(1,636)	(377)
Investment in affiliates	(22)
Proceeds from disposition of business	20
Other investing activities, net	1	(6)
Net cash provided by (used in) investing activities	(1,842)	(586)
Financing Activities
Proceeds from issuance of long-term debt	1,650	1,000
Proceeds from revolving credit facility borrowings		385
Repayment of revolving credit facility borrowings		(385)
Debt issuance costs	(22)	(13)
Dividends paid	(138)	(126)
Repurchases of common stock	(87)	(84)
Employee taxes on certain share-based payment arrangements	(7)	(13)
Net cash provided by (used in) financing activities	1,396	764
Change in cash and cash equivalents	43	669
Cash and cash equivalents, beginning of period	512	75
Cash and cash equivalents, end of period	555	744
Supplemental Cash Flow Disclosure
Cash paid for income taxes (net of refunds)	31	106
Cash paid for interest	39	33
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	$ 4	$ 8