Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 JPY (¥)	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum remaining maturity of foreign currency derivatives	30 days
Derivatives used in net investment hedge, net of tax						$ 4,020,000,000.00		$ 4,100,000,000
Percentage of long-term fixed-rate notes to floating rates through the use of interest rate swaps converted				11.00%	11.00%	11.00%	11.00%
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months						$ 16,400,000
Equity securities, net unrealized gains and (losses)	$ 164,700,000	$ 149,600,000
Other-than-temporary impairment losses		$ 0
Available-for-sale, percentage of nonperforming assets	96.00%
Amount of receivable derecognized						687,000,000.0		678,800,000
Buy U.S. Dollars Sell Euros
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount						946,200,000
Derivative asset, notional amount | €				€ 856.3
Buy Euros Sell U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount | €				€ 1,570.0
Derivative asset, notional amount						1,750,000,000
Buy U.S. Dollars Sell Japanese Yen
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount						291,200,000
Derivative asset, notional amount | ¥							¥ 31,260
Buy British Pounds and Sell U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount | £					£ 168.1
Derivative asset, notional amount						210,300,000
Swap U.S. Dollars to Euro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount						2,350,000,000
Swap Swiss Francs to U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount						1,000,000,000.00
Swap U.S. Dollars to British Pounds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount						396,000,000.0
Foreign Currency Denominated Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current portion						5,430,000,000		$ 5,490,000,000
Designated as Hedging Instrument | Cash Flow Hedging | Forward-starting interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount						$ 1,750,000,000
Subsequent Event | Senior Notes Due April 2050 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount			$ 1,000,000,000.00
Stated interest rate			2.25%