Borrowings (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2014		Dec. 29, 2013
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	$ 15,122		$ 13,328
Debt Instrument, Interest Rate, Effective Percentage	4.08%	[1]	4.00%	[1]
3 month LIBOR0.09% FRN due 2014
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	0		750
Debt Instrument, Interest Rate, Effective Percentage	0.00%		0.33%
1.20% Notes due 2014
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	0		999
Debt Instrument, Interest Rate, Effective Percentage	0.00%		1.24%
2.15% Notes due 2016
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	898		898
Debt Instrument, Interest Rate, Effective Percentage	2.22%		2.22%
3 month LIBOR0.07% FRN due 2016
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	800		800
Debt Instrument, Interest Rate, Effective Percentage	0.31%		0.31%
0.70% Notes due 2016
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	398		397
Debt Instrument, Interest Rate, Effective Percentage	0.74%		0.74%
5.55% Debentures due 2017
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	1,000		1,000
Debt Instrument, Interest Rate, Effective Percentage	5.55%		5.55%
1.125% Notes due 2017
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	697		0
Debt Instrument, Interest Rate, Effective Percentage	1.15%		0.00%
5.15% Debentures due 2018
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	898		898
Debt Instrument, Interest Rate, Effective Percentage	5.15%		5.15%
1.65% Notes due 2018
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	597		589
Debt Instrument, Interest Rate, Effective Percentage	1.70%		1.70%
4.75% Notes due 2019 (1B Euro 1.2199)(2)/ (1B Euro 1.3683)(3)
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	1,216	[2]	1,363	[3]
Debt Instrument, Interest Rate, Effective Percentage	5.83%		5.83%
1.875% Notes due 2019
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	497		0
Debt Instrument, Interest Rate, Effective Percentage	1.93%		0.00%
3% Zero Coupon Convertible Subordinated Debentures due 2020
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	158		179
Debt Instrument, Interest Rate, Effective Percentage	3.00%		3.00%
2.95% Debentures due 2020
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	543		542
Debt Instrument, Interest Rate, Effective Percentage	3.15%		3.15%
3.55% Notes due 2021
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	446		446
Debt Instrument, Interest Rate, Effective Percentage	3.67%		3.67%
2.45% Notes due 2021
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	349		0
Debt Instrument, Interest Rate, Effective Percentage	2.48%		0.00%
6.73% Debentures due 2023
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	250		250
Debt Instrument, Interest Rate, Effective Percentage	6.73%		6.73%
3.375% Notes due 2023
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	812	[4]	550
Debt Instrument, Interest Rate, Effective Percentage	3.17%		3.38%
5.50% Notes due 2024 (500MM GBP 1.5542)(2)/(500MM GBP 1.6414)(3)
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	772	[2]	816	[3]
Debt Instrument, Interest Rate, Effective Percentage	6.75%		6.75%
6.95% Notes due 2029
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	297		296
Debt Instrument, Interest Rate, Effective Percentage	7.14%		7.14%
4.95% Debentures due 2033
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	500		500
Debt Instrument, Interest Rate, Effective Percentage	4.95%		4.95%
4.375% Notes due 2033
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	865	[4]	646
Debt Instrument, Interest Rate, Effective Percentage	4.23%		4.42%
5.95% Notes due 2037
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	995		995
Debt Instrument, Interest Rate, Effective Percentage	5.99%		5.99%
5.85% Debentures due 2038
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	700		700
Debt Instrument, Interest Rate, Effective Percentage	5.86%		5.86%
4.50% Debentures due 2040
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	539		539
Debt Instrument, Interest Rate, Effective Percentage	4.63%		4.63%
4.85% Notes due 2041
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	298		298
Debt Instrument, Interest Rate, Effective Percentage	4.89%		4.89%
4.50% Notes due 2043
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	499		499
Debt Instrument, Interest Rate, Effective Percentage	4.52%		4.52%
Other
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	105		147
Debt Instrument, Interest Rate, Effective Percentage	0.00%		0.00%
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	15,122		13,328
Long-term Debt, Current Maturities	7		1,769
Long-term Debt	$ 15,129	[5]	$ 15,097	[5]

[1] Weighted average effective rate.

[2] Translation rate at December 28, 2014.

[3] Translation rate at December 29, 2013.

[4] Includes the reopening of these issues.

[5] The excess of the fair value over the carrying value of debt was $2.2 billion in 2014 and $1.4 billion in 2013.