Retirement Plans (Fair Value Of Pension Plan Assets) (Details) - USD ($) $ in Millions	Jan. 28, 2017	Jan. 30, 2016
Fair value of pension plan assets	$ 112	$ 132
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	20	13
Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	92	119
Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member]
Fair value of pension plan assets	3,377	3,246
Pension Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	1,421	1,311
Pension Plan [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	821	907
Pension Plan [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Cash and Cash Equivalents [Member]
Fair value of pension plan assets		15
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets		15
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets		0
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets		0
Pension Plan [Member] | Money market securities [Member]
Fair value of pension plan assets	14	36
Pension Plan [Member] | Money market securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Money market securities [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	14	36
Pension Plan [Member] | Money market securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Money market pooled funds [Member]
Fair value of pension plan assets	74	46
Pension Plan [Member] | Money market pooled funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	74	46
Pension Plan [Member] | Money market pooled funds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Money market pooled funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Equity securities [Member] | UNITED STATES
Fair value of pension plan assets	309	280
Pension Plan [Member] | Equity securities [Member] | United States pooled funds [Member]
Fair value of pension plan assets	654	391
Pension Plan [Member] | Equity securities [Member] | International [Member]
Fair value of pension plan assets	649	575
Pension Plan [Member] | Equity securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | UNITED STATES
Fair value of pension plan assets	309	280
Pension Plan [Member] | Equity securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United States pooled funds [Member]
Fair value of pension plan assets	446	207
Pension Plan [Member] | Equity securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | International [Member]
Fair value of pension plan assets	131	336
Pension Plan [Member] | Equity securities [Member] | Significant Observable Inputs (Level 2) [Member] | UNITED STATES
Fair value of pension plan assets	0	0
Pension Plan [Member] | Equity securities [Member] | Significant Observable Inputs (Level 2) [Member] | United States pooled funds [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Equity securities [Member] | Significant Observable Inputs (Level 2) [Member] | International [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | UNITED STATES
Fair value of pension plan assets	0	0
Pension Plan [Member] | Equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | United States pooled funds [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | International [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | U.S. Treasury bonds [Member]
Fair value of pension plan assets	194	233
Pension Plan [Member] | U.S. Treasury bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | U.S. Treasury bonds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	194	233
Pension Plan [Member] | U.S. Treasury bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Other Government bonds [Member]
Fair value of pension plan assets	40	41
Pension Plan [Member] | Other Government bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Other Government bonds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	40	41
Pension Plan [Member] | Other Government bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Agency backed bonds [Member]
Fair value of pension plan assets	24	31
Pension Plan [Member] | Agency backed bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Agency backed bonds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	24	31
Pension Plan [Member] | Agency backed bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Corporate bonds [Member]
Fair value of pension plan assets	453	433
Pension Plan [Member] | Corporate bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Corporate bonds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	453	433
Pension Plan [Member] | Corporate bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Mortgage-backed securities and forwards [Member]
Fair value of pension plan assets	85	112
Pension Plan [Member] | Mortgage-backed securities and forwards [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Mortgage-backed securities and forwards [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	85	112
Pension Plan [Member] | Mortgage-backed securities and forwards [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Asset-backed securities [Member]
Fair value of pension plan assets	17	28
Pension Plan [Member] | Asset-backed securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Asset-backed securities [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	17	28
Pension Plan [Member] | Asset-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Pooled funds [Member]
Fair value of pension plan assets	461	427
Pension Plan [Member] | Pooled funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	461	427
Pension Plan [Member] | Pooled funds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Pooled funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Real Estate [Member]
Fair value of pension plan assets	223	238
Pension Plan [Member] | Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Real Estate [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Hedge Funds [Member]
Fair value of pension plan assets		179
Pension Plan [Member] | Hedge Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets		0
Pension Plan [Member] | Hedge Funds [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets		0
Pension Plan [Member] | Hedge Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets		0
Pension Plan [Member] | Private equity [Member]
Fair value of pension plan assets	186	188
Pension Plan [Member] | Private equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Private equity [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Private equity [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Derivatives in a positive position [Member]
Fair value of pension plan assets	13	15
Pension Plan [Member] | Derivatives in a positive position [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Derivatives in a positive position [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	13	15
Pension Plan [Member] | Derivatives in a positive position [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Derivatives in a negative position [Member]
Fair value of pension plan assets	(19)	(22)
Pension Plan [Member] | Derivatives in a negative position [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension plan assets	0	0
Pension Plan [Member] | Derivatives in a negative position [Member] | Significant Observable Inputs (Level 2) [Member]
Fair value of pension plan assets	(19)	(22)
Pension Plan [Member] | Derivatives in a negative position [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension plan assets	$ 0	$ 0