Indebtedness (Long-Term Debt) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 29,620	$ 31,029
Less current portion of long-term debt	4,762	4,054
Long-term Debt	24,858	26,975
US Dollar Notes [Member]
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 20,518	20,819
Interest rate, average	3.466%
Due through	2044
US Dollar Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate	1.875%
US Dollar Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate	6.375%
Euro Notes [Member] \| Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 7,743	8,656
Interest rate, average	2.264%
Due through	2037
Euro Notes [Member] \| Foreign Currency Obligations [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate	0.625%
Euro Notes [Member] \| Foreign Currency Obligations [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate	3.125%
Swiss Franc Notes [Member] \| Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 1,177	1,374
Interest rate, average	1.337%
Due through	2024
Swiss Franc Notes [Member] \| Foreign Currency Obligations [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate	0.75%
Swiss Franc Notes [Member] \| Foreign Currency Obligations [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate	2.00%
Other [Member] \| Foreign Currency Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	$ 182	$ 180
Interest rate, average	3.234%
Due through	2024

The average effective interest rate during the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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

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

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Amount of long-term debt and lease obligation, including portion classified as current.

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