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Long-Term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 30,234,000,000 | $ 32,490,000,000 |
Debt due within one year | (6,722,000,000) | (6,256,000,000) |
Reclassified from short-term debt | 10,000,000,000 | 9,000,000,000 |
Unamortized discounts and debt issuance costs | (35,000,000) | (41,000,000) |
Total long-term debt | 33,477,000,000 | 35,193,000,000 |
Long-term debt maturing 2018 | 6,722,000,000 |  |
Long-term debt maturing 2019 | 5,000,000,000 |  |
Long-term debt maturing 2020 | 5,054,000,000 |  |
Long-term debt maturing 2021 | 2,054,000,000 |  |
Long-term debt maturing 2022 | 4,050,000,000 |  |
Long-term debt maturing after 2022 | 7,354,000,000 |  |
Notes Payable | 3.191% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 2,250,000,000 | 2,250,000,000 |
Interest rate | 3.191% |  |
Notes Payable | 2.954% notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 2,250,000,000 | 2,250,000,000 |
Interest rate | 2.954% |  |
Notes Payable | 1.718% notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 2,000,000,000 | 2,000,000,000 |
Interest rate | 1.718% |  |
Notes Payable | 2.355% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,750,000,000 | 2,000,000,000 |
Interest rate | 2.355% |  |
Notes Payable | 1.365% notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 2,000,000,000 | 1,750,000,000 |
Interest rate | 1.365% |  |
Notes Payable | 1.961% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,750,000,000 | 1,750,000,000 |
Interest rate | 1.961% |  |
Notes Payable | 4.950% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,500,000,000 | 1,500,000,000 |
Interest rate | 4.95% |  |
Notes Payable | 1.561% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,350,000,000 | 1,350,000,000 |
Interest rate | 1.561% |  |
Notes Payable | 2.100% notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,350,000,000 | 1,350,000,000 |
Interest rate | 2.10% |  |
Notes Payable | 1.790% notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,250,000,000 | 1,250,000,000 |
Interest rate | 1.79% |  |
Notes Payable | 2.419% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,250,000,000 | 1,250,000,000 |
Interest rate | 2.419% |  |
Notes Payable | 2.427% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,000,000,000 | 1,000,000,000 |
Interest rate | 2.427% |  |
Notes Payable | 2.895% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,000,000,000 | 0 |
Interest rate | 2.895% |  |
Notes Payable | 2.193% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 750,000,000 | 750,000,000 |
Interest rate | 2.193% |  |
Notes Payable | 2.566% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 750,000,000 | 750,000,000 |
Interest rate | 2.566% |  |
Notes Payable | 3.326% notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 750,000,000 | 750,000,000 |
Interest rate | 3.326% |  |
Notes Payable | 2.498% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 700,000,000 | 0 |
Interest rate | 2.498% |  |
Notes Payable | 2.411% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 700,000,000 | 700,000,000 |
Interest rate | 2.411% |  |
Notes Payable | 1.991% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 600,000,000 | 0 |
Interest rate | 1.991% |  |
Notes Payable | 1.686% notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 550,000,000 | 0 |
Interest rate | 1.686% |  |
Notes Payable | Medium-term notes, maturing from 2021 to 2038 (6.283%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 38,000,000 | 38,000,000 |
Notes Payable | 1.104% notes due 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 0 | 2,000,000,000 |
Interest rate | 1.104% |  |
Notes Payable | 1.345% notes due 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 0 | 1,100,000,000 |
Interest rate | 1.345% |  |
Notes Payable | 1.344% notes due 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 0 | 1,000,000,000 |
Interest rate | 1.344% |  |
Floating Rate Notes | Floating rate notes due 2018 (1.833%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 1,650,000,000 | 1,650,000,000 |
Interest rate | 1.833% |  |
Floating Rate Notes | Floating rate notes due 2019 (1.684%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 850,000,000 | 400,000,000 |
Interest rate | 1.684% |  |
Floating Rate Notes | Floating rate notes due 2021 (2.109%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 650,000,000 | 650,000,000 |
Interest rate | 2.109% |  |
Floating Rate Notes | Floating rate notes due 2022 (1.994%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 650,000,000 | 350,000,000 |
Interest rate | 1.994% |  |
Floating Rate Notes | Floating rate notes due 2020 (1.697%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 400,000,000 | 0 |
Interest rate | 1.697% |  |
Floating Rate Notes | Floating rate notes due 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 0 | 2,050,000,000 |
Bank Loans | Amortizing bank loan due 2018 (2.179%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 72,000,000 | 178,000,000 |
Interest rate | 2.179% |  |
Debentures | 8.625% debentures due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 147,000,000 | 147,000,000 |
Interest rate | 8.625% |  |
Debentures | 8.625% debentures due 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 108,000,000 | 108,000,000 |
Interest rate | 8.625% |  |
Debentures | 8.000% debentures due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 75,000,000 | 75,000,000 |
Interest rate | 8.00% |  |
Debentures | 9.750% debentures due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 54,000,000 | 54,000,000 |
Interest rate | 9.75% |  |
Debentures | 8.875% debentures due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 8.875% |  |
Medium-term Notes | 8.875% debentures due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt instruments | $ 40,000,000 | $ 40,000,000 |
Medium-term Notes | Medium-term notes, maturing from 2021 to 2038 (6.283%) |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 6.283% |  |
Corporate Bond Securities |  |  |
Debt Instrument [Line Items] |  |  |
Debt issued |  |  | $ 4,000,000,000

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