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Financial Instruments and Risk Management (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Debt_Instrument | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment maturity range (current) |  | 1 year |  |
Available-for-sale Securities, Debt Maturities, Date |  | Nov. 01, 2020 |  |
Foreign Currency Derivatives [Abstract] |  |  |  |
Maximum term of currency derivative instruments (in years) |  | 1 year |  |
Interest Rate Derivatives [Abstract] |  |  |  |
Number of debt instruments with related interest rate swaps | Debt_Instrument |  | 1 |  |
Long-term Debt, Excluding Current Maturities |  | $ 10,430 | $ 12,214 |
Early Repayment of Senior Debt | $ 1,400 |  |  |
Level 3 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total debt |  | 0 | 0 |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |  |
Fair value of marketable securities |  | 32 | 70 |
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |  |
Fair value of marketable securities |  | 0 | 0 |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |  |
Fair value of marketable securities |  | 106 | 92 |
Estimate of Fair Value, Fair Value Disclosure |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total debt |  | 12,457 | 13,565 |
Estimate of Fair Value, Fair Value Disclosure | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total debt |  | 3,285 | 753 |
Estimate of Fair Value, Fair Value Disclosure | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total debt |  | 9,172 | 12,812 |
Carrying (Reported) Amount, Fair Value Disclosure |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  | 10,942 | 12,384 |
Other current assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |  |
Available-for-sale securities, current |  | 69 |  |
Other assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |  |
Available-for-sale securities, noncurrent |  | 37 |  |
Interest Rate Swap [Member] |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |
Derivative, Notional Amount |  | 100 |  |
Foreign Exchange Contract [Member] |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |
Derivative, Notional Amount |  | 633 | 603 |
VENEZUELA |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Venezuela promissory note, carrying value |  | 32 | $ 70 |
Venezuela promissory note, par value |  | 175 |  | $ 200
VENEZUELA | Other assets |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Venezuela promissory note, carrying value |  | $ 32 |  |

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