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Long-term Debt and Debt Facility Agreements - Long-term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 14,644	$ 14,875
4.00% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,742	1,741
3.30% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,596	1,595
3.00% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,596	1,593
3.65% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,493	1,492
4.20% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,100	1,100
2.40% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	997	996
3.63% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	847	846
1.00% Guaranteed Notes due 2026
Debt Instrument [Line Items]
Long-term debt, carrying amount	678
2.65% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	598	598
2.20% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, carrying amount	499	498
7.00% Notes due 2038
Debt Instrument [Line Items]
Long-term debt, carrying amount	210	212
4.50% Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount	132	135
5.95% Notes due 2041
Debt Instrument [Line Items]
Long-term debt, carrying amount	115	115
3.60% Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	109	110
5.13% Notes due 2043
Debt Instrument [Line Items]
Long-term debt, carrying amount	99	99
4.00% Notes due 2023
Debt Instrument [Line Items]
Long-term debt, carrying amount	82	82
3.70% Notes due 2024
Debt Instrument [Line Items]
Long-term debt, carrying amount	55	56
0.63% Guaranteed Notes due 2019
Debt Instrument [Line Items]
Long-term debt, carrying amount		712
1.50% Guaranteed Notes due 2019
Debt Instrument [Line Items]
Long-term debt, carrying amount		603
Other
Debt Instrument [Line Items]
Long-term debt, carrying amount	263	598
Commercial paper borrowings
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 2,433	$ 1,694

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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