Financing Financing (Commercial Paper Program And Credit Facility) (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Jul. 10, 2015	Dec. 28, 2015	Oct. 15, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Long-term debt	$ 12,870.4				$ 3,473.4
Revolving credit facility
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity		$ 11,000.0
Consolidated leverage ratio	0.65
Long-term line of credit	$ 0.0
Revolving credit facility | Federal funds rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Revolving credit facility | LIBOR-based rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Revolving credit facility | Long-term debt | Superseded credit facility
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity		2,500.0
Revolving credit facility | Long-term debt | 5-Year Credit Facility
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity		$ 4,000.0
Debt instrument, extension option, term		1 year
Revolving credit facility | Short-term debt | 364-Day Facility
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity		$ 7,000.0	$ 2,000.0	$ 4,000.0
Debt instrument, extension option, term		1 year
Commercial paper
Line of Credit Facility [Line Items]
Commercial paper program, maximum borrowing capacity		$ 11,000.0
Long-term debt weighted average interest rate	0.20%
Long-term debt weighted average maturity	38 days
Long-term debt	$ 4,000.0