Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Jun. 28, 2013	Dec. 28, 2012
Fair Value [Member]
Fair Value, by Balance Sheet Grouping
Investments	$ 597	$ 743
Fair Value [Member] | Less than 1 year [Member]
Fair Value, by Balance Sheet Grouping
Investments	403	587
Fair Value [Member] | 1 - 2 years [Member]
Fair Value, by Balance Sheet Grouping
Investments	36	61
Fair Value [Member] | 2 - 5 years [Member]
Fair Value, by Balance Sheet Grouping
Investments	139	76
Fair Value [Member] | Greater than 5 years [Member]
Fair Value, by Balance Sheet Grouping
Investments	19	19
Fair Value [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, by Balance Sheet Grouping
Investments	400	555
Fair Value [Member] | Corporate Bonds [Member]
Fair Value, by Balance Sheet Grouping
Investments	131	122
Fair Value [Member] | Government Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	51	51
Fair Value [Member] | Auction Rate Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	15	15
Fair Value [Member] | Level 1 [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 1 [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 1 [Member] | Corporate Bonds [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 1 [Member] | Government Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 1 [Member] | Auction Rate Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 2 [Member]
Fair Value, by Balance Sheet Grouping
Investments	582	728
Long-term Debt (Including Current Maturities)	10,417	11,562
Fair Value [Member] | Level 2 [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, by Balance Sheet Grouping
Investments	400	555
Fair Value [Member] | Level 2 [Member] | Corporate Bonds [Member]
Fair Value, by Balance Sheet Grouping
Investments	131	122
Fair Value [Member] | Level 2 [Member] | Government Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	51	51
Fair Value [Member] | Level 2 [Member] | Auction Rate Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 3 [Member]
Fair Value, by Balance Sheet Grouping
Investments	15	15
Fair Value [Member] | Level 3 [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 3 [Member] | Corporate Bonds [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 3 [Member] | Government Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	0	0
Fair Value [Member] | Level 3 [Member] | Auction Rate Securities [Member]
Fair Value, by Balance Sheet Grouping
Investments	15	15
Carrying Value [Member]
Fair Value, by Balance Sheet Grouping
Amortized cost basis of investments	595	742
Carrying Value [Member] | Level 2 [Member]
Fair Value, by Balance Sheet Grouping
Long-term Debt (Including Current Maturities)	$ 9,375	$ 9,832