Debt Obligations and Commitments (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Jun. 08, 2015
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 2,500.0
Gain (Loss) on Extinguishment of Debt	233.0
Extinguishment of Debt, Gain (Loss), Net of Tax	$ 156.0
Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax	$ 0.11
Commercial Paper	$ 2,257.0	$ 770.0
Debt, Current	6,892.0	4,071.0
Long-term Debt	34,454.0	32,322.0
Long-term Debt Obligations	30,053.0	$ 29,213.0
International Divisions
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 235.0
Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.40%	3.00%
Senior Notes	$ 2,249.0	$ 1,290.0
Notes Due 2022 to 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.70%	3.90%
Senior Notes	$ 18,558.0	$ 13,938.0
Notes Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.30%	3.60%
Senior Notes	$ 2,561.0	$ 4,122.0
Commercial Paper Zero Point Six Percentage_ [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.60%
Commercial Paper Zero Point Three Percentage_ [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		0.30%
Current Maturities Of Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	$ 4,401.0	$ 3,109.0
Other Borrowings Short-term [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.40%	10.00%
Other Short-term Borrowings	$ 234.0	$ 192.0
Notes Due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.40%	1.20%
Senior Notes	$ 4,398.0	$ 4,392.0
Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.70%	3.70%
Senior Notes	$ 2,837.0	$ 1,627.0
Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.60%	2.40%
Senior Notes	$ 3,816.0	$ 3,830.0
Notes Due 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.00%	2.60%
Senior Notes	$ 0.0	$ 3,087.0
Five-Year Unsecured Revolving Credit Agreement (Five-Year Credit Agreement) [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	3,722.5		$ 3,722.5
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,500.0
Other Debt Instruments due 2017 to 2026 [Domain]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.40%	4.30%
Other Notes Payable	$ 35.0	$ 36.0
Seven Point Nine Zero Percent Notes Due 2018 [Member] | Notes Due 2018 [Member]
Debt Instrument [Line Items]
Interest rate on debt	7.90%
Debt Instrument, Repurchased Face Amount	$ 1,500.0
Variable Rate [Member] | Notes Due 2019 [Member]
Debt Instrument [Line Items]
Fixed and floating rate notes issued	400.0
Variable Rate [Member] | Notes Due 2021 [Member]
Debt Instrument [Line Items]
Fixed and floating rate notes issued	250.0
Variable Rate [Member] | Notes Due 2019
Debt Instrument [Line Items]
Fixed and floating rate notes issued	$ 250.0
Five Point One Two Five Percent Notes Due 2019 [Member] | Notes Due 2019 [Member]
Debt Instrument [Line Items]
Interest rate on debt	5.125%
Debt Instrument, Repurchased Face Amount	$ 750.0
364-Day Unsecured Revolving Credit Agreement (364-Day Credit Agreement) [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	3,722.5		$ 3,722.5
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,500.0