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Loans Payable, Long-Term Debt and Other Commitments - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 19,806	$ 21,353
2.75% notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 2,490	2,488
Stated interest rate (as percent)	2.75%
3.70% notes due 2045
Debt Instrument [Line Items]
Long-term debt	$ 1,974	1,973
Stated interest rate (as percent)	3.70%
2.80% notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 1,745	1,744
Stated interest rate (as percent)	2.80%
4.15% notes due 2043
Debt Instrument [Line Items]
Long-term debt	$ 1,237	1,237
Stated interest rate (as percent)	4.15%
1.85% notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 1,231	1,232
Stated interest rate (as percent)	1.85%
2.35% notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,214	1,220
Stated interest rate (as percent)	2.35%
1.125% euro-denominated notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 1,134	1,185
Stated interest rate (as percent)	1.125%
3.875% notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 1,132	1,140
Stated interest rate (as percent)	3.875%
1.875% euro-denominated notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 1,127	1,178
Stated interest rate (as percent)	1.875%
2.40% notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 983	993
Stated interest rate (as percent)	2.40%
6.50% notes due 2033
Debt Instrument [Line Items]
Long-term debt	$ 726	729
Stated interest rate (as percent)	6.50%
Floating-rate notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 699	699
0.50% euro-denominated notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 565	591
Stated interest rate (as percent)	0.50%
1.375% euro-denominated notes due 2036
Debt Instrument [Line Items]
Long-term debt	$ 561	587
Stated interest rate (as percent)	1.375%
2.50% euro-denominated notes due 2034
Debt Instrument [Line Items]
Long-term debt	$ 560	585
Stated interest rate (as percent)	2.50%
3.60% notes due 2042
Debt Instrument [Line Items]
Long-term debt	$ 490	489
Stated interest rate (as percent)	3.60%
6.55% notes due 2037
Debt Instrument [Line Items]
Long-term debt	$ 414	415
Stated interest rate (as percent)	6.55%
5.75% notes due 2036
Debt Instrument [Line Items]
Long-term debt	$ 338	338
Stated interest rate (as percent)	5.75%
5.95% debentures due 2028
Debt Instrument [Line Items]
Long-term debt	$ 306	306
Stated interest rate (as percent)	5.95%
5.85% notes due 2039
Debt Instrument [Line Items]
Long-term debt	$ 270	270
Stated interest rate (as percent)	5.85%
6.40% debentures due 2028
Debt Instrument [Line Items]
Long-term debt	$ 250	250
Stated interest rate (as percent)	6.40%
6.30% debentures due 2026
Debt Instrument [Line Items]
Long-term debt	$ 135	135
Stated interest rate (as percent)	6.30%
5.00% notes due 2019
Debt Instrument [Line Items]
Long-term debt	$ 0	1,260
Stated interest rate (as percent)	5.00%
Other
Debt Instrument [Line Items]
Long-term debt	$ 225	$ 309

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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