Indebtedness (Long-Term Debt) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 29,338	$ 30,707
Less current portion of long-term debt	1,992	4,051
Long-term debt	$ 27,346	26,656
US Dollar Notes [Member]
Debt Instrument [Line Items]
Average interest rate	3.342%
Long-term debt, including current maturities	$ 19,732	19,783
US Dollar Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.125%
US Dollar Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	6.375%
Euro Notes [Member] \| Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Average interest rate	1.983%
Long-term debt, including current maturities	$ 8,811	9,822
Euro Notes [Member] \| Foreign Currency Obligations [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	0.125%
Euro Notes [Member] \| Foreign Currency Obligations [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.125%
Swiss Franc Notes [Member] \| Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Average interest rate	1.83%
Long-term debt, including current maturities	$ 597	899
Swiss Franc Notes [Member] \| Foreign Currency Obligations [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.625%
Swiss Franc Notes [Member] \| Foreign Currency Obligations [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%
Other [Member] \| Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Average interest rate	3.019%
Long-term debt, including current maturities	$ 198	$ 203

The average effective interest rate during the reporting period.

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