Debt - Narrative (Details)			3 Months Ended			12 Months Ended						18 Months Ended
		Apr. 01, 2016 USD ($)	Apr. 01, 2016 USD ($)	Jan. 01, 2016 GBP (£)	Oct. 02, 2015 EUR (€) Subsidiary	Apr. 01, 2016 USD ($)		Apr. 03, 2015 USD ($)		Mar. 28, 2014 USD ($)		Oct. 02, 2015 EUR (€)	Jun. 14, 2016 USD ($)	Apr. 01, 2016 GBP (£)	Apr. 01, 2016 EUR (€)	Dec. 31, 2015 GBP (£)	Dec. 18, 2013 GBP (£)	Sep. 27, 2013
Debt Instrument [Line Items]
Net loss on extinguishment of debt	[1]					$ 95,000,000	[2]	$ 0	[3]	$ 0	[3]
Repayments of debt	[1]					1,869,000,000		242,000,000		492,000,000
Repayments of lines of credit	[1]					1,825,000,000		32,000,000		0
Long-term debt		$ 2,085,000,000	$ 2,085,000,000			2,085,000,000		2,518,000,000
Borrowings under lines of credit and short-term debt	[1]					2,206,000,000		0		439,000,000
Number of subsidiaries | Subsidiary					2
Borrowings of commercial paper	[1]					821,000,000		0		0
Repayments of commercial paper	[1]					263,000,000		0		$ 0
Capital leased assets, gross		699,000,000	699,000,000			699,000,000		633,000,000
Capital leased assets, accumulated depreciation		$ 563,000,000	$ 563,000,000			$ 563,000,000		455,000,000
Euro-denominated commercial paper
Debt Instrument [Line Items]
Debt, weighted average interest rate		0.15%	0.15%			0.15%								0.15%	0.15%
Euro-denominated commercial paper | CSC Capital Funding Limited
Debt Instrument [Line Items]
Amount of multi-year committed revolving credit facility | €					€ 500,000,000							€ 500,000,000
Debt instrument term					364 days
Borrowings of commercial paper						$ 821,000,000
Repayments of commercial paper						263,000,000
Credit facility | Revolving credit facility
Debt Instrument [Line Items]
Proceeds from line of credit used to redeem debt						675,000,000
Amount of multi-year committed revolving credit facility		$ 2,500,000,000.0	$ 2,500,000,000.0			2,500,000,000.0
Repayments of lines of credit						$ 1,800,000,000
Debt, weighted average interest rate		2.67%	2.67%			2.67%								2.67%	2.67%
Line of credit borrowings outstanding		$ 395,000,000	$ 395,000,000			$ 395,000,000		0
Borrowings under lines of credit and short-term debt						$ 2,200,000,000
Credit facility | CSC Asset Funding I LLC
Debt Instrument [Line Items]
Amount of multi-year committed revolving credit facility								$ 250,000,000
Debt instrument term				22 months								18 months
Credit facility | CSC Asset Funding I LLC | One-Month London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, basis spread on variable rate								1.00%
Interest rate during period						1.44%
Euro-denominated commercial paper
Debt Instrument [Line Items]
Long-term debt		559,000,000	559,000,000			$ 559,000,000									€ 500,000,000
Borrowings for assets acquired under long-term financing
Debt Instrument [Line Items]
Line of credit borrowings outstanding		51,000,000	51,000,000			51,000,000		$ 95,000,000
Other borrowings
Debt Instrument [Line Items]
Long-term debt		$ 4,000,000	$ 4,000,000			$ 4,000,000		$ 3,000,000
4.45% term notes, due September 2022 | Senior unsecured and unsubordinated notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate		4.45%	4.45%			4.45%		4.45%						4.45%	4.45%			4.45%
Long-term debt		$ 454,000,000	$ 454,000,000			$ 454,000,000		$ 451,000,000
Euro-denominated commercial paper | Senior unsecured and unsubordinated notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate		6.50%	6.50%			6.50%		6.50%						6.50%	6.50%
Repayments of debt						$ 918,000,000
Repayments of debt, accrued interest						26,000,000
Repayments of debt, redemption premiums						94,000,000
Net loss on extinguishment of debt						97,000,000
Loss related to cash flow hedge associated with extinguished debt						1,000,000
Write off of unamortized debt discount and debt issuance costs						2,000,000
Long-term debt		$ 0	$ 0			0		$ 917,000,000
Loan payable, due March 2018 | Loans payable
Debt Instrument [Line Items]
Repayments of debt						68,000,000
Long-term debt		$ 0	$ 0			$ 0		$ 68,000,000
2.50% term notes, due September 2015 | Senior unsecured and unsubordinated notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate		2.50%	2.50%			2.50%		2.50%						2.50%	2.50%
Long-term debt		$ 0	$ 0			$ 0		$ 350,000,000
2.50% term notes, due September 2015 | Secured Debt
Debt Instrument [Line Items]
Repayments of lines of credit						$ 350,000,000
Loan payable, due March 2021 | Loans payable
Debt Instrument [Line Items]
Debt instrument, stated interest rate		5.00%	5.00%			5.00%								5.00%	5.00%
Debt instrument, initial face amount		$ 525,000,000	$ 525,000,000			$ 525,000,000
Debt instrument, optional face amount maximum		775,000,000	775,000,000			775,000,000
Debt instrument, face amount		$ 575,000,000	$ 575,000,000			$ 575,000,000
Debt, weighted average interest rate		1.68%	1.68%			1.68%								1.68%	1.68%
Long-term debt		$ 575,000,000	$ 575,000,000			$ 575,000,000		0
Loan payable, due March 2021 | Loans payable | Adjusted LIBOR for a One, Two, Three or Six Month Interest Period | Minimum
Debt Instrument [Line Items]
Debt, basis spread on variable rate			0.75%
Loan payable, due March 2021 | Loans payable | Adjusted LIBOR for a One, Two, Three or Six Month Interest Period | Maximum
Debt Instrument [Line Items]
Debt, basis spread on variable rate			1.50%
Loan payable, due March 2021 | Loans payable | Federal Funds Rate
Debt Instrument [Line Items]
Debt, basis spread on variable rate			0.50%
Loan payable, due March 2021 | Loans payable | Adjusted LIBOR for One-Month Interest Period
Debt Instrument [Line Items]
Debt, basis spread on variable rate			1.00%
Loan payable, due March 2021 | Loans payable | Pricing Grid Consistent with Credit Facility
Debt Instrument [Line Items]
Debt, basis spread on variable rate			0.50%
Delayed-draw unsecured term loan | Unsecured debt | CSC Computer Sciences UK Holdings Ltd
Debt Instrument [Line Items]
Debt instrument, face amount | £				£ 200,000,000
Long-term debt		$ 284,000,000	$ 284,000,000			284,000,000										£ 200,000,000
Debt instrument, face amount, higher commitment option | £				£ 300,000,000
Delayed-draw unsecured term loan | Unsecured debt | CSC Computer Sciences UK Holdings Ltd | Three-Month London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, basis spread on variable rate		1.28%		0.65%
Notes Payable, Due January 2016 | Loans payable
Debt Instrument [Line Items]
Repayments of debt | £				£ 200,000,000
Debt instrument, face amount | £																	£ 250,000,000
Loan payable, due May 2016 | Loans payable
Debt Instrument [Line Items]
Long-term debt		$ 71,000,000	71,000,000			71,000,000		371,000,000						£ 50,000,000
Lease credit facility, various | Secured Debt
Debt Instrument [Line Items]
Long-term debt		49,000,000	49,000,000			49,000,000		0
Other interest bearing debt and notes payable | Other borrowings
Debt Instrument [Line Items]
Long-term debt		$ 4,000,000	$ 4,000,000			$ 4,000,000		$ 3,000,000
Subsequent event | Credit facility | CSC Asset Funding I LLC
Debt Instrument [Line Items]
Amount of multi-year committed revolving credit facility													$ 150,000,000

[1] Due to the adoption of ASU 2016-09 certain balances related to employee stock-based compensation were adjusted retrospectively as discussed in Note 1 .

[2] Due to the adoption of ASU 2016-09 certain balances related to excess tax benefits from stock compensation were adjusted prospectively as described in Note 1.

[3] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes as described in Note 1 and to give effect to discontinued operations as described in Note 4.