Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 19, 2016	Mar. 21, 2015
Losses/(gains) on cash flow hedges:
Total before tax		$ (21)	$ 179
Tax amounts		5	(70)
Net (gains)/losses after tax		(16)	109
Amortization of pension and retiree medical items:
Amortization of prior service credit (a)		(9)	(10)
Net actuarial losses		46	61
Total before tax		37	51
Tax amounts		(12)	(17)
Net losses after tax		25	34
Total net losses reclassified for the period, net of tax		9	143
Cash Flow Hedges
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges		(21)	179
Cash Flow Hedges | Foreign exchange contracts
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	[1]	(21)	(22)
Cash Flow Hedges | Foreign exchange contracts | Cost of Sales
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges		(21)	(22)
Cash Flow Hedges | Interest rate derivatives
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	[1]	(3)	193
Cash Flow Hedges | Interest rate derivatives | Interest Expense
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges		(3)	193
Cash Flow Hedges | Commodity contracts
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	[1]	3	8
Cash Flow Hedges | Commodity contracts | Cost of Sales
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges		1	5
Cash Flow Hedges | Commodity contracts | Selling, General and Administrative Expenses
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges		$ 2	$ 3

[1] Foreign exchange derivative gains/losses are primarily included in cost of sales. Interest rate derivative gains/losses are included in interest expense. Commodity derivative gains/losses are included in either cost of sales or selling, general and administrative expenses, depending on the underlying commodity.