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Long-term Debt and Debt Facility Agreements - Long-term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 14,770	$ 14,644
3.30% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,597	1,596
3.65% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,495	1,493
3.90% Senior Notes due 2028
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,444
2.40% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	998	997
4.00% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt, carrying amount	929	1,742
4.30% Senior Notes due 2029
Debt Instrument [Line Items]
Long-term debt, carrying amount	845
3.75% Senior Notes due 2024
Debt Instrument [Line Items]
Long-term debt, carrying amount	746
1.00% Guaranteed Notes due 2026
Debt Instrument [Line Items]
Long-term debt, carrying amount	665	678
4.20% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount	600	1,100
2.65% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	598	598
0.00% Notes due 2024
Debt Instrument [Line Items]
Long-term debt, carrying amount	551
0.25% Notes due 2027
Debt Instrument [Line Items]
Long-term debt, carrying amount	550
0.50% Notes due 2031
Debt Instrument [Line Items]
Long-term debt, carrying amount	544
3.63% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	294	847
7.00% Notes due 2038
Debt Instrument [Line Items]
Long-term debt, carrying amount	208	210
5.95% Notes due 2041
Debt Instrument [Line Items]
Long-term debt, carrying amount	114	115
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	81	82
3.70% Notes due 2024
Debt Instrument [Line Items]
Long-term debt, carrying amount	55	55
3.00% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, carrying amount		1,596
2.20% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, carrying amount		499
4.50% Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount		132
3.60% Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount		109
Other
Debt Instrument [Line Items]
Long-term debt, carrying amount	135	263
Commercial paper borrowings
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 2,222	$ 2,433

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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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