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Debt - Long Term Debt (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Total debt | $ 15,498 | $ 15,294
Less: unamortized discounts and issuance costs | (1,235) | (1,012)
Total debt, net | 14,263 | 14,282
Less: current portion | (750) | 0
Long-term debt, net | $ 13,513 | $ 14,282
1.85% due 2018 |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.85% | 1.85%
Long-term debt maturity year | 2018 | 2018
Total debt | $ 750 | $ 750
4.25% due 2019 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.25% | 4.25%
Long-term debt maturity year | 2019 | 2019
Total debt | $ 900 | $ 900
2.50% due 2020 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.50% | 2.50%
Long-term debt maturity year | 2020 | 2020
Total debt | $ 1,250 | $ 1,250
3.35% due 2021 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.35% | 3.35%
Long-term debt maturity year | 2021 | 2021
Total debt | $ 900 | $ 900
3.10% due 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.10% | 3.10%
Long-term debt maturity year | 2023 | 2023
Total debt | $ 500 | $ 500
2.90% due 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.90% | 2.90%
Long-term debt maturity year | 2025 | 2025
Total debt | $ 750 | $ 750
3.55% due 2026 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.55% | 3.55%
Long-term debt maturity year | 2026 | 2026
Total debt | $ 2,000 | $ 2,000
3.60% due 2035 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.60% | 3.60%
Long-term debt maturity year | 2035 | 2035
Total debt | $ 500 | $ 500
4.50% and 6.15% due 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt maturity year | 2036 | 2036
Total debt | $ 1,054 | $ 1,152
4.50% and 6.15% due 2036 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.50% | 4.50%
4.50% and 6.15% due 2036 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 6.15% | 6.15%
4.85% due 2041 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.85% | 4.85%
Long-term debt maturity year | 2041 | 2041
Total debt | $ 239 | $ 600
4.07% due 2042 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.07% | 4.07%
Long-term debt maturity year | 2042 | 2042
Total debt | $ 1,336 | $ 1,336
3.80% due 2045 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.80% | 3.80%
Long-term debt maturity year | 2045 | 2045
Total debt | $ 1,000 | $ 1,000
4.70% due 2046 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.70% | 4.70%
Long-term debt maturity year | 2046 | 2046
Total debt | $ 1,326 | $ 2,000
4.09% due 2052 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.09% | 4.09%
Long-term debt maturity year | 2052 | 2052
Total debt | $ 1,578 | $ 0
Other notes with rates from 5.50% to 8.50%, due 2023 to 2040 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,415 | $ 1,656
Other notes with rates from 5.50% to 8.50%, due 2023 to 2040 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.50% | 5.50%
Long-term debt maturity year | 2023 | 2023
Other notes with rates from 5.50% to 8.50%, due 2023 to 2040 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 8.50% | 8.50%
Long-term debt maturity year | 2040 | 2040

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