Debt (The Carrying Value Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 14,091.6	$ 14,727.9
Commercial paper program	379.2	570.9
Capital Lease Obligations	0	0.3
Current portion of long-term debt	(518.0)	(557.1)
Long-term debt, less current portion	13,573.6	14,170.8
Senior Unsecured Notes [Member] | 6.000%, due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt	0	399.8
Interest rate on long-term debt	6.00%	6.00%
Senior Unsecured Notes [Member] | 5.000%, due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt	518.0	535.9
Interest rate on long-term debt	5.00%	5.00%
Senior Unsecured Notes [Member] | 1.250%, due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt	624.9	624.8
Interest rate on long-term debt	1.25%	1.25%
Senior Unsecured Notes [Member] | 5.250%, due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	1,109.6	1,114.0
Interest rate on long-term debt	5.25%	5.25%
Senior Unsecured Notes [Member] | 2.375%, due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	399.6	401.5
Interest rate on long-term debt	2.375%	2.375%
Senior Unsecured Notes [Member] | 5.875%, due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	545.1	697.4
Interest rate on long-term debt	5.875%	5.875%
Senior Unsecured Notes [Member] | 1.875%, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	614.5	625.2
Interest rate on long-term debt	1.875%	1.875%
Senior Unsecured Notes [Member] | 2.300%, due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	647.5	0
Interest rate on long-term debt	2.30%	2.30%
Senior Unsecured Notes [Member] | 7.500%, due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	0	556.9
Interest rate on long-term debt	7.50%	7.50%
Senior Unsecured Notes [Member] | 7.000%, due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	452.9	599.3
Interest rate on long-term debt	7.00%	7.00%
Senior Unsecured Notes [Member] | 4.350%, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	688.9	701.0
Interest rate on long-term debt	4.35%	4.35%
Senior Unsecured Notes [Member] | 3.700%, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	699.4	699.3
Interest rate on long-term debt	3.70%	3.70%
Senior Unsecured Notes [Member] | 3.125%, due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	846.3	845.9
Interest rate on long-term debt	3.125%	3.125%
Senior Unsecured Notes [Member] | 3.300%, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	996.9	996.7
Interest rate on long-term debt	3.30%	3.30%
Senior Unsecured Notes [Member] | 5.950%, due 2034 [Member]
Debt Instrument [Line Items]
Long-term debt	447.3	498.8
Interest rate on long-term debt	5.95%	5.95%
Senior Unsecured Notes [Member] | 5.850%, due 2036 [Member]
Debt Instrument [Line Items]
Long-term debt	775.6	895.7
Interest rate on long-term debt	5.85%	5.85%
Senior Unsecured Notes [Member] | 6.375%, due 2037 [Member]
Debt Instrument [Line Items]
Long-term debt	651.4	796.7
Interest rate on long-term debt	6.375%	6.375%
Senior Unsecured Notes [Member] | 5.800%, due 2040 [Member]
Debt Instrument [Line Items]
Long-term debt	216.2	296.8
Interest rate on long-term debt	5.80%	5.80%
Senior Unsecured Notes [Member] | 4.625%, due 2042 [Member]
Debt Instrument [Line Items]
Long-term debt	893.9	893.7
Interest rate on long-term debt	4.625%	4.625%
Senior Unsecured Notes [Member] | 4.650%, due 2043 [Member]
Debt Instrument [Line Items]
Long-term debt	994.4	994.2
Interest rate on long-term debt	4.65%	4.65%
Senior Unsecured Notes [Member] | 5.100%, due 2044 [Member]
Debt Instrument [Line Items]
Long-term debt	599.1	0
Interest rate on long-term debt	5.10%	5.10%
Senior Convertible Debentures [Member] | 2.750%, due 2042 [Member]
Debt Instrument [Line Items]
Long-term debt	966.0	958.1
Interest rate on long-term debt	2.75%	2.75%
Surplus Notes [Member] | 9.000%, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 24.9	$ 25.0
Interest rate on long-term debt	9.00%	9.00%