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Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 23,730 | $ 30,234
Debt due within one year |  | (5,000) | (6,722)
Reclassified from short-term debt |  | 9,900 | 10,000
Unamortized discounts and debt issuance costs |  | (24) | (35)
Capital lease obligations |  | 127 | 94
Total long-term debt | [1] | 28,733 | 33,571
Long-term debt maturing 2019 |  | 5,000 |
Long-term debt maturing 2020 |  | 5,054 |
Long-term debt maturing 2021 |  | 2,272 |
Long-term debt maturing 2022 |  | 4,050 |
Long-term debt maturing 2023 |  | 3,003 |
Long-term debt maturing after 2023 |  | 4,351 |
Notes | 3.191% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 2,250 | 2,250
Interest rate |  | 3.191% |
Notes | 2.954% notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 2,250 | 2,250
Interest rate |  | 2.954% |
Notes | 2.355% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 2,000 | 2,000
Interest rate |  | 2.355% |
Notes | 1.961% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 1,750 | 1,750
Interest rate |  | 1.961% |
Notes | 4.950% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 1,500 | 1,500
Interest rate |  | 4.95% |
Notes | 1.561% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 1,350 | 1,350
Interest rate |  | 1.561% |
Notes | 2.100% notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 1,350 | 1,350
Interest rate |  | 2.10% |
Notes | 2.419% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 1,250 | 1,250
Interest rate |  | 2.419% |
Notes | 2.427% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 1,000 | 1,000
Interest rate |  | 2.427% |
Notes | 2.895% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 1,000 | 1,000
Interest rate |  | 2.895% |
Notes | 2.193% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 750 | 750
Interest rate |  | 2.193% |
Notes | 2.566% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 750 | 750
Interest rate |  | 2.566% |
Notes | 3.326% notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 750 | 750
Interest rate |  | 3.326% |
Notes | 2.498% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 700 | 700
Interest rate |  | 2.498% |
Notes | 2.411% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 700 | 700
Interest rate |  | 2.411% |
Notes | 1.991% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 600 | 600
Interest rate |  | 1.991% |
Notes | 1.686% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 550 | 550
Interest rate |  | 1.686% |
Notes | 1.718% notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 0 | 2,000
Interest rate |  | 1.718% |
Notes | 1.365% notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 0 | 1,750
Interest rate |  | 1.365% |
Notes | 1.790% notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 0 | 1,250
Interest rate |  | 1.79% |
Floating Rate Notes | Floating rate notes due 2019 (2.905%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 850 | 850
Interest rate |  | 2.905% |
Floating Rate Notes | Floating rate notes due 2021 (3.313%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 650 | 650
Interest rate |  | 3.313% |
Floating Rate Notes | Floating rate notes due 2022 (3.245%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 650 | 650
Interest rate |  | 3.254% |
Floating Rate Notes | Floating rate notes due 2020 (2.948%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 400 | 400
Interest rate |  | 2.948% |
Floating Rate Notes | Floating rate notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 0 | 1,650
Loans | 3.400% loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 218 | 0
Interest rate |  | 3.40% |
Loans | Amortizing bank loan due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 0 | 72
Debentures | 8.625% debentures due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 147 | 147
Interest rate |  | 8.625% |
Debentures | 8.625% debentures due 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 108 | 108
Interest rate |  | 8.625% |
Debentures | 8.000% debentures due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 75 | 75
Interest rate |  | 8.00% |
Debentures | 9.750% debentures due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 54 | 54
Interest rate |  | 9.75% |
Debentures | 8.875% debentures due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 40 | 40
Interest rate |  | 8.875% |
Medium-term Notes | Medium-term notes, maturing from 2021 to 2038 (6.629%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments |  | $ 38 | $ 38
Interest rate |  | 6.629% |
[1] | Includes capital lease obligations of $127 and $94 at December 31, 2018 and 2017, respectively.

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