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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 2,890	$ 3,146	$ 5,814	$ 6,088
Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	100.00%	100.00%	100.00%	100.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	100.00%	100.00%	100.00%	100.00%
Revenue from Contract with Customer Benchmark | Contractor Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	100.00%	100.00%	100.00%	100.00%
Prime Contractor
Disaggregation of Revenue [Line Items]
Revenue	$ 2,701	$ 3,001	$ 5,442	$ 5,809
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	93.00%	95.00%	94.00%	95.00%
Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 189	$ 145	$ 372	$ 279
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	7.00%	5.00%	6.00%	5.00%
Defense Customers
Disaggregation of Revenue [Line Items]
Revenue	$ 1,580	$ 1,547	$ 3,097	$ 2,968
Defense Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	54.00%	49.00%	53.00%	48.00%
Intelligence Customers
Disaggregation of Revenue [Line Items]
Revenue	$ 483	$ 494	$ 967	$ 951
Intelligence Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	17.00%	16.00%	17.00%	16.00%
Civil Customers
Disaggregation of Revenue [Line Items]
Revenue	$ 827	$ 1,105	$ 1,750	$ 2,169
Civil Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	29.00%	35.00%	30.00%	36.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,713	$ 1,781	$ 3,471	$ 3,441
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	59.00%	57.00%	60.00%	56.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 638	$ 722	$ 1,276	$ 1,393
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	22.00%	23.00%	22.00%	23.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 539	$ 643	$ 1,067	$ 1,254
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	19.00%	20.00%	18.00%	21.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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