Acquisitions (Narrative) (Details) - USD ($)								3 Months Ended			4 Months Ended	9 Months Ended
	Jul. 05, 2016	May 05, 2016	Feb. 26, 2016	Dec. 29, 2015	Dec. 11, 2015	Sep. 24, 2015	Sep. 17, 2015	Dec. 30, 2016	Jan. 01, 2016	[2]	May 05, 2016	Dec. 30, 2016	Jan. 01, 2016		Apr. 01, 2016
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired												$ 434,000,000	$ 265,000,000	[1]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill								$ 1,780,000,000				1,780,000,000			$ 1,277,000,000
Revenues								1,917,000,000	$ 1,750,000,000			5,718,000,000	5,299,000,000	[2]
Income from continuing operations								37,000,000	$ 22,000,000			38,000,000	$ 180,000,000	[2]
Aspediens
Business Acquisition [Line Items]
Total consideration paid	$ 15,000,000
Payments for acquisitions, net of cash acquired	8,000,000
Fair value of contingent consideration	6,000,000
Contingent consideration held for one year as security for potential claims against seller	1,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Current assets acquired	9,000,000
Noncurrent assets	1,000,000
Intangible assets acquired	9,000,000
Current liabilities acquired	8,000,000
Long-term liabilities acquired	5,000,000
Goodwill	9,000,000
Transaction costs (less than 1 million)	$ 1,000,000
Xchanging
Business Acquisition [Line Items]
Total consideration paid		$ 623,000,000		$ 70,000,000							$ 693,000,000
Payments for acquisitions, net of cash acquired											492,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill								636,000,000				636,000,000
Transaction costs (less than 1 million)		$ 17,000,000									$ 17,000,000
Number of shares purchased (in shares)				24,636,553
Business acquisition, share price (in USD per share)		$ 2.76		$ 2.83							$ 2.76
Percentage of equity interest acquired				9.99%
Acquired debt		$ 254,000,000						254,000,000			$ 254,000,000	254,000,000
Revenues								126,000,000				335,000,000
Income from continuing operations								12,000,000				23,000,000
UXC
Business Acquisition [Line Items]
Total consideration paid			$ 302,000,000
Payments for acquisitions, net of cash acquired			289,000,000
Cash acquired			13,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Current assets acquired			125,000,000
Noncurrent assets			37,000,000
Intangible assets acquired			91,000,000
Current liabilities acquired			153,000,000
Long-term liabilities acquired			50,000,000
Goodwill			252,000,000
Transaction costs (less than 1 million)			$ 7,000,000
Axon Puerto Rico
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired					$ 29,000,000
Cash acquired					5,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Current assets acquired					5,000,000
Noncurrent assets					3,000,000
Intangible assets acquired					11,000,000
Current liabilities acquired					2,000,000
Goodwill					12,000,000
Transaction costs (less than 1 million)					$ 1,000,000
Fixnetix
Business Acquisition [Line Items]
Total consideration paid						$ 112,000,000
Payments for acquisitions, net of cash acquired						88,000,000
Cash acquired						1,000,000
Fair value of contingent consideration						$ 19,000,000						0
Fruition Partners
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired							$ 148,000,000
Cash acquired							$ 2,000,000
Customer relationships | Aspediens
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Amortizable lives	10 years
Customer relationships | Xchanging
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Amortizable lives		15 years
Customer relationships | UXC
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Amortizable lives			10 years
Customer relationships | Axon Puerto Rico
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Amortizable lives					10 years
GBS
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill								1,393,000,000				1,393,000,000			914,000,000
GBS | Xchanging
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Expected incremental cash flows		$ 604,000,000
GIS
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill								$ 387,000,000				$ 387,000,000			$ 363,000,000
GIS | Xchanging
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Expected incremental cash flows		$ 32,000,000

[1] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes and for the adoption of ASU 2016-09 related to employee stock-based compensation. See Note 20 - Reconciliation of Previously Reported Amounts.

[2] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes and for the adoption of ASU 2016-09 related to employee stock-based compensation. See Note 20 - Reconciliation of Previously Reported Amounts.