Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Operating Activities
Net earnings (loss)	$ 149	$ 149
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation	55	54
Amortization of purchased intangibles	21	25
Stock-based compensation	21	24
Deferred income taxes	43	(11)
Loss (gain) on investments in marketable securities	3	(3)
Other non-cash transactions, net	3	3
Change in
Accounts Receivable	(67)	(175)
Contract assets	(231)	(334)
Inventoried costs	(11)	(7)
Prepaid expenses and other assets	7	44
Accounts payable and accruals	(338)	(126)
Retiree benefits	(45)	(38)
Net cash provided by (used in) operating activities	(390)	(395)
Investing Activities
Capital expenditure additions	(74)	(67)
Grant proceeds for capital expenditures	3
Acquisitions of businesses		(133)
Proceeds from disposition of assets		1
Net cash provided by (used in) investing activities	(71)	(199)
Financing Activities
Proceeds from revolving credit facility borrowings	15
Repayment of revolving credit facility borrowings	(15)
Dividends paid	(54)	(53)
Employee taxes on certain share-based payment arrangements	(43)	(14)
Other financing activities, net		(3)
Net cash provided by (used in) financing activities	(97)	(70)
Change in cash and cash equivalents	(558)	(664)
Cash and cash equivalents, beginning of period	774	831
Cash and cash equivalents, end of period	216	167
Supplemental Cash Flow Disclosure
Cash paid for interest	35	8
Non-Cash Investing and Financing Activities
Capital expenditures accrued in accounts payable	$ 13	$ 16

Cash inflow associated with the amount received by grants from the government for capital expenditures.

No definition available.

Name:	hii_Grantproceedsforcapitalexpenditures
Namespace Prefix:	hii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash outflow from a contractual arrangement with the lender, including letters of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

No definition available.