Indebtedness (Long-Term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term debt	$ 28,424	$ 27,655
Less current portion of long-term debt	2,573	2,405
Long-term debt	25,851	25,250
US Dollar Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 19,857	18,091
Interest rate, average	3.662%
Due through (maturity year)	2044
Foreign Currency Obligations [Member] \| Euro Notes Payable [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 6,828	7,423
Interest rate, average	2.40%
Due through (maturity year)	2036
Foreign Currency Obligations [Member] \| Swiss Franc Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,312	1,690
Interest rate, average	1.269%
Due through (maturity year)	2024
Foreign Currency Obligations [Member] \| Other Payable [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 427	$ 451
Interest rate, average	3.162%
Due through (maturity year)	2024
Minimum [Member] \| US Dollar Notes [Member]
Debt Instrument [Line Items]
Interest rate	1.125%
Minimum [Member] \| Foreign Currency Obligations [Member] \| Euro Notes Payable [Member]
Debt Instrument [Line Items]
Interest rate	1.75%
Minimum [Member] \| Foreign Currency Obligations [Member] \| Swiss Franc Notes [Member]
Debt Instrument [Line Items]
Interest rate	0.75%
Maximum [Member] \| US Dollar Notes [Member]
Debt Instrument [Line Items]
Interest rate	6.375%
Maximum [Member] \| Foreign Currency Obligations [Member] \| Euro Notes Payable [Member]
Debt Instrument [Line Items]
Interest rate	3.125%
Maximum [Member] \| Foreign Currency Obligations [Member] \| Swiss Franc Notes [Member]
Debt Instrument [Line Items]
Interest rate	2.00%

The average effective interest rate during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Amount of long-term debt and capital lease obligations including current maturities.

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No definition available.

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