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Long-term Debt - Summary of Long-term Debt (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, carrying amount | $ 13,865 | $ 14,875
Commercial paper borrowings |  |
Debt Instrument [Line Items] |  |
Long-term debt, carrying amount | 2,200 | 1,694
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 | 1,595 | 1,595
3.00% Senior Notes due 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt, carrying amount | 1,595 | 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 | 846 | 846
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 | 498 | 498
7.00% Notes due 2038 |  |
Debt Instrument [Line Items] |  |
Long-term debt, carrying amount | 211 | 212
4.50% Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt, carrying amount | 134 | 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 | 56 | 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 | $ 395 | $ 598

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- Definition 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 + Details
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