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Debt - Long Term Debt (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Total debt | $ 15,312 | $ 15,498
Commercial paper | 600 | 0
Less: unamortized discounts and issuance costs | (1,208) | (1,235)
Total debt, net | 14,104 | 14,263
Less: current portion | (1,500) | (750)
Long-term debt, net | $ 12,604 | $ 13,513
1.85% due 2018 |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.85% | 1.85%
Long-term debt maturity year | 2018 |
Total debt | $ 0 | $ 750
4.25% due 2019 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.25% |
Long-term debt maturity year | 2019 |
Total debt | $ 900 | 900
2.50% due 2020 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.50% |
Long-term debt maturity year | 2020 |
Total debt | $ 1,250 | 1,250
3.35% due 2021 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.35% |
Long-term debt maturity year | 2021 |
Total debt | $ 900 | 900
3.10% due 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.10% |
Long-term debt maturity year | 2023 |
Total debt | $ 500 | 500
2.90% due 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.90% |
Long-term debt maturity year | 2025 |
Total debt | $ 750 | 750
3.55% due 2026 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.55% |
Long-term debt maturity year | 2026 |
Total debt | $ 2,000 | 2,000
3.60% due 2035 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.60% |
Long-term debt maturity year | 2035 |
Total debt | $ 500 | 500
4.50% and 6.15% due 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt maturity year | 2036 |
Total debt | $ 1,054 | 1,054
4.50% and 6.15% due 2036 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.50% |
4.50% and 6.15% due 2036 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 6.15% |
4.07% due 2042 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.07% |
Long-term debt maturity year | 2042 |
Total debt | $ 1,336 | 1,336
3.80% due 2045 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.80% |
Long-term debt maturity year | 2045 |
Total debt | $ 1,000 | 1,000
4.70% due 2046 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.70% |
Long-term debt maturity year | 2046 |
Total debt | $ 1,326 | 1,326
4.09% due 2052 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.09% |
Long-term debt maturity year | 2052 |
Total debt | $ 1,578 | 1,578
Other notes with rates from 4.85% to 8.50%, due 2023 to 2041 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,618 | $ 1,654
Other notes with rates from 4.85% to 8.50%, due 2023 to 2041 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.85% |
Long-term debt maturity year | 2023 |
Other notes with rates from 4.85% to 8.50%, due 2023 to 2041 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 8.50% |
Long-term debt maturity year | 2041 |

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