Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans Retirement Benefit Plans (Accumulated Benefit Obligation) (Details)

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Retirement Benefit Plans Retirement Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($)
$ in Millions
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 3,200 $ 3,100  
Fair value of plan assets 3,455 3,287 $ 5,474
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 133 153  
Fair value of plan assets $ 0 $ 0 $ 0