Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Income Taxes [Abstract]
Effective tax rate	(0.40%)	29.80%	2.70%	30.40%
Income tax benefits due to change in tax status of subsidiary			$ 121
Favorable impact on the effective tax rate due to change in tax status of a foreign subsidiary (in hundredths)			4.40%
Tax benefits recognized due to audit settlements and expiration of statute of limitations	112
Favorable impact on effective tax rate due to settlement of tax audits (in hundredths)			4.10%
Impairment of goodwill	2,685	0	2,685	0
Statutory tax rate (in hundredths)	35.00%		35.00%
Decrease in uncertain tax positions			185
Tax attributes on uncertain tax positions			75
Decrease in uncertain tax positions due to settlement of IRS examination and lapse of statute of limitations	186
Tax attributes on uncertain tax positions related to settlement of IRS examination and lapse of statute of limitations	26
Increase in uncertain tax positions related to acquisitions of two companies	13
Tax attributes on uncertain tax positions related to company acquisitions	49
Liability for uncertain tax positions including interest and penalties	220		220
Liability for interest recognized	29		29
Tax related to interest liability due to settlement with IRS			18
Liability for penalties recognized	16		16
Interest benefit due to settlement with IRS			38
Interest benefit due to settlement with IRS, net of tax			24
Penalties released due to settlement with IRS			18
Uncertain tax positions that would impact effective tax rate	123		123
Range of possible reduction in liability for uncertain tax positions - maximum			$ 23

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in tax status of foreign subsidiaries.

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The amount of interest benefit recognized in the period arising from settlement with Internal Revenue Services.

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The amount of interest benefit, net of tax, recognized in the period arising from settlement with Internal Revenue Services.

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The amount of penalties released recognized in the period arising from settlement with Internal Review Services.

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The amount of tax related to interest accrued recognized in the period arising from income tax examinations.

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The amount recognized for uncertain tax positions including interest and penalties as of the balance sheet date

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Maximum gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities excluding interest, penalties, and tax carryforwards.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities and lapse of statute of limitations.

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The gross amount of increases in unrecognized tax benefits resulting from acquisitions by the company.

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The gross of amount tax attributes that reduce the decrease in uncertain tax positions during the current period.

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The gross of amount tax attributes related to uncertain tax benefits resulting from acquisitions of the company.

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The gross of amount tax attributes that reduce the decrease in uncertain tax positions related to settlement of IRS examination and lapse of statute of limitations.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Subparagraph 2

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to all income tax settlements during the period.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e(2)

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The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations.

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The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations.

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The portion of the difference, between total income tax expense (benefit) as reported in the Income Statement for the year/accounting period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy.

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Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 10A, 10B, 10C

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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-Paragraph 21

-Subparagraph a(2)

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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