Indebtedness (Long-Term Debt) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 26,932	$ 30,707
Less current portion of long-term debt	1,933	4,051
Long-term debt	24,999	26,656
US Dollar Notes [Member]
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 17,489	19,783
Average interest rate	3.567%
US Dollar Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.875%
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]
Long-term debt, including current maturities	$ 8,331	9,822
Average interest rate	1.983%
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]
Long-term debt, including current maturities	$ 915	899
Average interest rate	1.521%
Swiss Franc Notes [Member] \| Foreign Currency Obligations [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.00%
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]
Long-term debt, including current maturities	$ 197	$ 203
Average interest rate	3.009%

The average effective interest rate during the reporting period.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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