Stock Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				12 Months Ended	9 Months Ended				9 Months Ended			9 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012 number_of_plans	Dec. 30, 2011	Dec. 28, 2012 Cost of services [Member]	Dec. 30, 2011 Cost of services [Member]	Dec. 28, 2012 Cost of services [Member]	Dec. 30, 2011 Cost of services [Member]	Dec. 28, 2012 Selling, general and administrative [Member]	Dec. 30, 2011 Selling, general and administrative [Member]	Dec. 28, 2012 Selling, general and administrative [Member]	Dec. 30, 2011 Selling, general and administrative [Member]	Dec. 28, 2012 Stock options [Member]	Dec. 30, 2011 Stock options [Member]	Mar. 30, 2012 Stock options [Member]	Dec. 28, 2012 Stock Options and RSU's [Member]	Dec. 30, 2011 Stock Options and RSU's [Member]	Dec. 28, 2012 Other stock based incentives [Member]	Dec. 28, 2012 Other stock based incentives [Member] Service-based RSU's [Member] Y Anniversary	Dec. 28, 2012 Restricted stock awards and other stock based incentives [Member]	Dec. 28, 2012 Nonemployee director incentives [Member]	Dec. 28, 2012 Restricted stock units [Member]	Dec. 28, 2012 Nonemployee director incentives [Member] number_of_plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 16	$ 14	$ 36	$ 36	$ 5	$ 3	$ 11	$ 8	$ 11	$ 11	$ 25	$ 28
Share Based Compensation Net Of Tax	10	9	23	22
Change In Pre Tax Stock Based Compensation Due To Performance Based Stock Units			(3)
Adjustment In Stock Compensation Expense Due To Actual Forfeiture True Up			3	5
Grants in Period, Weighted Average Price Per Share													$ 7.27	$ 10.18
Risk Free Interest Rate													1.14%	1.80%
Expected Volatility Rate													36.00%	31.00%
Expected term (in years)													6 years 7 months 2 days	6 years 1 month 10 days
Expected Dividend Rate													2.88%	1.79%
Tax Benefit Realized from Exercise of Options																3	6
Excess tax benefit related to stock incentive plans													1	2
Number of incentive plans within the employee or nonemployee plan			3																				2
Number of common shares available for grant at period end	11,061,469		11,061,469																				72,400
Vesting period - minimum (in years)																		3 years
Vesting period - maximum (in years)																		5 years
Issue price of award (in dollars per share)																						$ 0.00
Number of anniversaries following the executive's termination that the shares are redeemable																			10
Number of Option Shares
Outstanding beginning of period (in shares)													17,733,562
Granted (in shares)													3,644,573
Exercised (in shares)													(189,457)
Canceled/Forfeited (in shares)													(626,915)
Expired (in shares)													(3,451,852)
Outstanding end of period (in shares)													17,109,911		17,733,562
Vested and expected to vest [Abstract]
Vested and expected to vest in the future as of period end (in shares)													16,778,977
Exercisable as of period end (in shares)													12,034,893
Weighted Average Exercise Price
Weighted average exercise price -beginning of period (in dollars per share)													$ 46.13
Weighted average exercise price - granted (in dollars per share)													$ 27.14
Weighted average exercise price - exercised (in dollars per share)													$ 30.48
Weighted average exercise price - cancelled/forfeited (in dollars per share)													$ 37.16
Weighted average exercise price - expired (in dollars per share)													$ 44.91
Weighted average exercise price - end of period (in dollars per share)													$ 42.83		$ 46.13
Weighted average exercise price vested and expected to vest as of period end (in dollars per share)													$ 43.10
Weighted average exercise price exercisable as of period end (in dollars per share)													$ 47.44
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life (in years)													5 years 8 months 19 days		5 years 0 months 29 days
Weighted average remaining contractual life vested and expected to vest in the future as of period end (in years)													5 years 7 months 24 days
Weighted average remaining contractual life exercisable as of period end (in years)													4 years 3 months 29 days
Aggregate intrinsic value													45		1
Aggregate intrinsic value vested and expected to vest in the future as of period end													42
Aggregate intrinsic value exercisable as of period end													3
Aggregate disclosures [Abstract]
Total intrinsic value of options exercised during the period			1	5
Cash received from stock awards exercised during the period			4	15
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures	$ 33		$ 33																	$ 42
Weighted average period over which cost is expected to be recognized (in years)			1 year 11 months 19 days																	2 years 3 months 15 days
Equity instruments other than options nonvested [Roll Forward]
Equity instruments other than options nonvested - beginning balance (in shares)																		1,740,925			196,361
Equity instruments other than options nonvested - granted (in shares)																		1,698,839			42,800
Equity instruments other than options nonvested - released/redeemed (in shares)																		(254,238)			(50,716)
Equity instruments other than options nonvested - canceled/forfeited (in shares)																		(578,840)			0
Equity instruments other than options nonvested - ending balance (in shares)																		2,606,686			188,445
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average fair value other than options - beginning balance (in dollars per share)																		$ 40.29			$ 42.81
Weighted average fair value other than options - granted (in dollars per share)																		$ 25.86			$ 30.30
Weighted average fair value other than options - released/redeemed (in dollars per share)																		$ 40.18			$ 43.30
Weighted average fair value other than options - canceled/forfeited (in dollars per share)																		$ 39.68			$ 0
Weighted average fair value other than options - ending balance (in dollars per share)																		$ 31.04			$ 39.85
Share-based Compensation Arrangement by Share-based Payment Award, Age Covenant																			65
Share-based Compensation Arrangement by Share-based Payment Award, Age Covenant, with Ten Years of Service																			55
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Service Period			10 years