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Retirement Benefit Plans (Defined Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified |
0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | ||||||||
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Oct. 15, 2011
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May 24, 2010
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Feb. 02, 2013
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Jan. 29, 2011
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Sep. 30, 2012
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Jan. 28, 2012
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Oct. 01, 2011
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Sep. 30, 2012
Primary Plan Benefits [Member]
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Oct. 15, 2011
Primary Plan Benefits [Member]
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Feb. 02, 2013
Primary Plan Benefits [Member]
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Jan. 28, 2012
Primary Plan Benefits [Member]
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Sep. 30, 2012
Supplemental Plan Benefits [Member]
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Feb. 02, 2013
Supplemental Plan Benefits [Member]
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Jan. 28, 2012
Supplemental Plan Benefits [Member]
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Oct. 15, 2011
Supplemental Retirement Program [Member]
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Oct. 15, 2011
Supplemental Retirement Program [Member]
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Oct. 15, 2011
Benefit Restoration Plan [Member]
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Oct. 15, 2011
Benefit Restoration Plan [Member]
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| Enhanced Retirement Beneifts, Number of Employees Eligible | 8,000 | |||||||||||||||||
| Enhanced Reitirement Benefits, Number of Employees Accepted | 4,000 | |||||||||||||||||
| Special termination benefits | $ 176 | $ 133 | $ 133 | $ 43 | $ 36 | $ 7 | ||||||||||||
| Curtailments | (80) | (13) | ||||||||||||||||
| Discount rate | 5.06% | 4.19% | 5.65% | 4.25% | 4.82% | |||||||||||||
| Projected benefit obligation, period increase/(decrease) | 166 | 55 | 71 | 24 | ||||||||||||||
| Defined Benefit Plan Funded Status Of Plan Percentage | As of the end of 2012, the funded status of the Primary Pension Plan was just under 100%. The PBO is the present value of benefits earned to date by plan participants, including the effect of assumed future salary increases. Under the Employee Retirement Income Security Act of 1974 (ERISA), the funded status of the plan exceeded 100% as of December 31, 2012 and 2011, the qualified pension plan's year end. | |||||||||||||||||
| Defined Benefit Plan, Actual Return on Plan Assets, Percent | 13.00% | |||||||||||||||||
| Defined Benefit Plan, Cumulative Return on Plan Assets Since Inception, Percent | 9.00% | |||||||||||||||||
| Defined Benefit Plan, Accumulated Benefit Obligation | 4,700 | 4,900 | 268 | 272 | ||||||||||||||
| Pension contribution from issuance of $400 million of 5.65% Senior Notes due 2020 | 392 | 392 | ||||||||||||||||
| Defined Benefit Plan, Expected Future Benefit Payments in Year One | $ 358 | $ 53 | ||||||||||||||||