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Preferred Stock (Schedule of Preferred Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 27, 2014		Dec. 28, 2013		Dec. 29, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, end of year	$ 17,548us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest		$ 24,389us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest		$ 22,399us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued	800,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember	[1]	800,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember	[1]	800,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember	[1]
Preferred stock, value	41us-gaap_PreferredStockValueOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember		41us-gaap_PreferredStockValueOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember		41us-gaap_PreferredStockValueOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Repurchased Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of year (in shares)	600,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]	600,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]	600,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]
Balance, beginning of year	171us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember		164us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember		157us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember
Redemptions (in shares)	100,000us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]	0us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]	0us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]
Redemptions	10us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember		7us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember		7us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember
Balance, end of year (in shares)	700,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]	600,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]	600,000us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember	[1]
Balance, end of year	$ 181us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember		$ 171us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember		$ 164us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_RedeemablePreferredStockMember
[1] In millions.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

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Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders.

+ References

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-Publisher FASB

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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-Topic 810

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Number of stock bought back by the entity at the exercise price or redemption price.

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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

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