Pension, Retiree Medical And Savings Plans (Categorized Plan Assets Measured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified																																																														12 Months Ended																																																																				12 Months Ended
	Dec. 31, 2011 U.S. Plan Assets [Member]	Dec. 25, 2010 U.S. Plan Assets [Member]	Dec. 31, 2011 International Plan Assets [Member]	Dec. 25, 2010 International Plan Assets [Member]	Dec. 31, 2011 Retiree Medical Plan [Member]	Dec. 25, 2010 Retiree Medical Plan [Member]	Dec. 26, 2009 Retiree Medical Plan [Member]	Dec. 31, 2011 Preferred Stock [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 Preferred Stock [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Level 2 [Member] Preferred Stock [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 U.S. Common Stock [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 U.S. Common Stock [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 U.S. Common Stock [Member] Level 1 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 U.S. Commingled Funds [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 U.S. Commingled Funds [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 U.S. Commingled Funds [Member] International Plan Assets [Member]		Dec. 25, 2010 U.S. Commingled Funds [Member] International Plan Assets [Member]		Dec. 31, 2011 U.S. Commingled Funds [Member] Level 2 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 U.S. Commingled Funds [Member] Level 2 [Member] International Plan Assets [Member]		Dec. 31, 2011 International Common Stock [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 International Common Stock [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 International Common Stock [Member] Level 1 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 International Commingled Fund [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 International Commingled Fund [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 International Commingled Fund [Member] International Plan Assets [Member]		Dec. 25, 2010 International Commingled Fund [Member] International Plan Assets [Member]		Dec. 31, 2011 International Commingled Fund [Member] Level 2 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 International Commingled Fund [Member] Level 2 [Member] International Plan Assets [Member]		Dec. 31, 2011 Government Securities [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 Government Securities [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Government Securities [Member] International Plan Assets [Member]		Dec. 25, 2010 Government Securities [Member] International Plan Assets [Member]		Dec. 31, 2011 Government Securities [Member] Level 2 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Government Securities [Member] Level 2 [Member] International Plan Assets [Member]		Dec. 31, 2011 Corporate Bonds [Member]	Dec. 25, 2010 Corporate Bonds [Member]	Dec. 31, 2011 Corporate Bonds [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 Corporate Bonds [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Corporate Bonds [Member] International Plan Assets [Member]		Dec. 25, 2010 Corporate Bonds [Member] International Plan Assets [Member]		Dec. 31, 2011 Corporate Bonds [Member] Level 2 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Corporate Bonds [Member] Level 2 [Member] International Plan Assets [Member]		Dec. 31, 2011 Mortgage-Backed Securities [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 Mortgage-Backed Securities [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Mortgage-Backed Securities [Member] Level 2 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Contracts With Insurance Companies [Member] U.S. Plan Assets [Member]		Dec. 25, 2010 Contracts With Insurance Companies [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Contracts With Insurance Companies [Member] International Plan Assets [Member]		Dec. 25, 2010 Contracts With Insurance Companies [Member] International Plan Assets [Member]		Dec. 31, 2011 Contracts With Insurance Companies [Member] Level 3 [Member] U.S. Plan Assets [Member]		Dec. 31, 2011 Contracts With Insurance Companies [Member] Level 3 [Member] International Plan Assets [Member]		Dec. 31, 2011 Cash And Cash Equivalents [Member] U.S. Plan Assets [Member]	Dec. 25, 2010 Cash And Cash Equivalents [Member] U.S. Plan Assets [Member]	Dec. 31, 2011 Cash And Cash Equivalents [Member] International Plan Assets [Member]	Dec. 25, 2010 Cash And Cash Equivalents [Member] International Plan Assets [Member]	Dec. 31, 2011 Cash And Cash Equivalents [Member] Level 1 [Member] U.S. Plan Assets [Member]	Dec. 31, 2011 Cash And Cash Equivalents [Member] Level 1 [Member] International Plan Assets [Member]	Dec. 31, 2011 Sub-Total U.S. Plan Assets [Member] U.S. Plan Assets [Member]	Dec. 25, 2010 Sub-Total U.S. Plan Assets [Member] U.S. Plan Assets [Member]	Dec. 31, 2011 Sub-Total U.S. Plan Assets [Member] Level 1 [Member] U.S. Plan Assets [Member]	Dec. 31, 2011 Sub-Total U.S. Plan Assets [Member] Level 2 [Member] U.S. Plan Assets [Member]	Dec. 31, 2011 Sub-Total U.S. Plan Assets [Member] Level 3 [Member] U.S. Plan Assets [Member]	Dec. 31, 2011 Fixed Income Commingled Funds [Member] International Plan Assets [Member]		Dec. 25, 2010 Fixed Income Commingled Funds [Member] International Plan Assets [Member]		Dec. 31, 2011 Fixed Income Commingled Funds [Member] Level 2 [Member] International Plan Assets [Member]		Dec. 31, 2011 Currency Commingled Funds [Member] International Plan Assets [Member]		Dec. 25, 2010 Currency Commingled Funds [Member] International Plan Assets [Member]		Dec. 31, 2011 Currency Commingled Funds [Member] Level 2 [Member] International Plan Assets [Member]		Dec. 31, 2011 Other Commingled Fund [Member] International Plan Assets [Member]		Dec. 31, 2011 Other Commingled Fund [Member] Level 2 [Member] International Plan Assets [Member]		Dec. 31, 2011 Sub-Total International Plan Assets [Member] International Plan Assets [Member]	Dec. 25, 2010 Sub-Total International Plan Assets [Member] International Plan Assets [Member]	Dec. 31, 2011 Sub-Total International Plan Assets [Member] Level 1 [Member] International Plan Assets [Member]	Dec. 31, 2011 Sub-Total International Plan Assets [Member] Level 2 [Member] International Plan Assets [Member]	Dec. 31, 2011 Sub-Total International Plan Assets [Member] Level 3 [Member] International Plan Assets [Member]	Dec. 31, 2011 Dividends And Interest Receivable [Member] U.S. Plan Assets [Member]	Dec. 25, 2010 Dividends And Interest Receivable [Member] U.S. Plan Assets [Member]	Dec. 31, 2011 Dividends And Interest Receivable [Member] International Plan Assets [Member]	Dec. 25, 2010 Dividends And Interest Receivable [Member] International Plan Assets [Member]	Dec. 31, 2011 Large-Cap Fund(s) In U.S. Commingled Funds [Member]	Dec. 25, 2010 Large-Cap Fund(s) In U.S. Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Representation of one fund in total U.S. plan assets																																																														24.00%	22.00%																																																																			30.00%	32.00%
Fair value of plan assets	$ 9,262	$ 9,060	$ 2,031	$ 1,896	$ 190	$ 190	$ 13	$ 19	[1]	$ 4	[1]	$ 19	[1]	$ 514	[2]	$ 304	[2]	$ 514	[2]	$ 3,003	[3]	$ 3,426	[3]	$ 246	[3]	$ 193	[3]	$ 3,003	[3]	$ 246	[3]	$ 1,089	[2]	$ 834	[2]	$ 1,089	[2]	$ 776	[4]	$ 992	[4]	$ 729	[4]	$ 779	[4]	$ 776	[4]	$ 729	[4]	$ 1,032	[1]	$ 950	[1]	$ 171	[1]	$ 184	[1]	$ 1,032	[1]	$ 171	[1]			$ 2,653	[1],[5]	$ 2,374	[1],[5]	$ 196	[1]	$ 152	[1]	$ 2,653	[1],[5]	$ 196	[1]	$ 24	[1]	$ 20	[1]	$ 24	[1]	$ 24	[6]	$ 28	[6]	$ 30	[6]	$ 28	[6]	$ 24	[6]	$ 30	[6]	$ 78	$ 81	$ 16	$ 120	$ 78	$ 16	$ 9,212	$ 9,013	$ 1,681	$ 7,507	$ 24	$ 530	[7]	$ 393	[7]	$ 530	[7]	$ 52	[8]	$ 42	[8]	$ 52	[8]	$ 56	[9]	$ 56	[9]	$ 2,026	$ 1,891	$ 16	$ 1,980	$ 30	$ 50	$ 47	$ 5	$ 5
Retiree medical plan assets					$ 190	$ 190

[1] Based on quoted bid prices for comparable securities in the marketplace and broker/dealer quotes that are not observable.

[2] Based on quoted market prices in active markets.

[3] Based on the fair value of the investments owned by these funds that track various U.S. large, mid-cap and small company indices. Includes one large-cap fund that represents 30% and 32%, respectively, of total U.S. plan assets for 2011 and 2010.

[4] Based on the fair value of the investments owned by these funds that track various non-U.S. equity indices.

[5] Corporate bonds of U.S.-based companies represent 24% and 22%, respectively, of total U.S. plan assets for 2011 and 2010.

[6] Based on the fair value of the contracts as determined by the insurance companies using inputs that are not observable.

[7] Based on the fair value of the investments owned by these funds that track various government and corporate bond indices.

[8] Based on the fair value of the investments owned by these funds. Includes managed hedge funds that invest primarily in derivatives to reduce currency exposure.

[9] Based on the fair value of the investments owned by this fund that tracks various indices.