Income Taxes (Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 25, 2015	Dec. 26, 2014
Components of Deferred Tax Assets [Abstract]
Pension Plans	$ 207	$ 188
Other Employee Benefit Plans	258	306
Other	261	256
Total	726	750
Components of Deferred Tax Liabilities [Abstract]
Accelerated Depreciation	9,614	9,133
Other	291	334
Total	9,905	9,467
Net Deferred Income Tax Liabilities	$ 9,179	$ 8,717