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Loans Payable, Long-Term Debt and Other Commitments - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 21,353	$ 24,274
2.75% notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 2,488	2,487
Stated interest rate (as percent)	2.75%
3.70% notes due 2045
Debt Instrument [Line Items]
Long-term debt	$ 1,973	1,972
Stated interest rate (as percent)	3.70%
2.80% notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 1,744	1,743
Stated interest rate (as percent)	2.80%
5.00% notes due 2019
Debt Instrument [Line Items]
Long-term debt	$ 1,260	1,273
Stated interest rate (as percent)	5.00%
4.15% notes due 2043
Debt Instrument [Line Items]
Long-term debt	$ 1,237	1,236
Stated interest rate (as percent)	4.15%
1.85% notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 1,232	1,238
Stated interest rate (as percent)	1.85%
2.35% notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,220	1,228
Stated interest rate (as percent)	2.35%
1.125% euro-denominated notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 1,185	1,035
Stated interest rate (as percent)	1.125%
1.875% euro-denominated notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 1,178	1,028
Stated interest rate (as percent)	1.875%
3.875% notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 1,140	1,152
Stated interest rate (as percent)	3.875%
2.40% notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 993	1,003
Stated interest rate (as percent)	2.40%
6.50% notes due 2033
Debt Instrument [Line Items]
Long-term debt	$ 729	806
Stated interest rate (as percent)	6.50%
Floating-rate notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 699	698
0.50% euro-denominated notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 591	516
Stated interest rate (as percent)	0.50%
1.375% euro-denominated notes due 2036
Debt Instrument [Line Items]
Long-term debt	$ 587	512
Stated interest rate (as percent)	1.375%
2.50% euro-denominated notes due 2034
Debt Instrument [Line Items]
Long-term debt	$ 585	511
Stated interest rate (as percent)	2.50%
3.60% notes due 2042
Debt Instrument [Line Items]
Long-term debt	$ 489	489
Stated interest rate (as percent)	3.60%
6.55% notes due 2037
Debt Instrument [Line Items]
Long-term debt	$ 415	594
Stated interest rate (as percent)	6.55%
5.75% notes due 2036
Debt Instrument [Line Items]
Long-term debt	$ 338	369
Stated interest rate (as percent)	5.75%
5.95% debentures due 2028
Debt Instrument [Line Items]
Long-term debt	$ 306	355
Stated interest rate (as percent)	5.95%
5.85% notes due 2039
Debt Instrument [Line Items]
Long-term debt	$ 270	415
Stated interest rate (as percent)	5.85%
6.40% debentures due 2028
Debt Instrument [Line Items]
Long-term debt	$ 250	325
Stated interest rate (as percent)	6.40%
6.30% debentures due 2026
Debt Instrument [Line Items]
Long-term debt	$ 135	152
Stated interest rate (as percent)	6.30%
Floating-rate borrowing due 2018
Debt Instrument [Line Items]
Long-term debt	$ 0	999
1.10% notes due 2018
Debt Instrument [Line Items]
Long-term debt	$ 0	999
Stated interest rate (as percent)	1.10%
1.30% notes due 2018
Debt Instrument [Line Items]
Long-term debt	$ 0	985
Stated interest rate (as percent)	1.30%
Other
Debt Instrument [Line Items]
Long-term debt	$ 309	$ 154

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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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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