Cash, Cash Equivalents and Current Marketable Securities (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash	$ 2,336us-gaap_Cash	$ 2,789us-gaap_Cash
Government securities and obligations	20,610	7,632
Reverse repurchase agreements	6,735	15,006
Corporate debt securities	1,343	1,467
Money market funds	1,352us-gaap_MoneyMarketFundsAtCarryingValue	1,886us-gaap_MoneyMarketFundsAtCarryingValue
Time deposits	713us-gaap_TimeDepositsAtCarryingValue	426us-gaap_TimeDepositsAtCarryingValue
Total cash, cash equivalents and current marketable securities	$ 33,089	$ 29,206

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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