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Derivative and Financial Instruments - Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 3,716	$ 6,325
Short-term Investments	875	1,873
Cash [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	511	948
Time Deposits [Member] | Remaining maturities from 1 to 90 days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	2,966	5,004
Short-term Investments	104	821
Commercial Paper [Member] | Remaining maturities from 1 to 90 days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	239	373
Short-term Investments	771	978
Commercial Paper [Member] | Remaining maturities from 91 to 180 days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	0	0
Short-term Investments	$ 0	$ 74

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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