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Derivative and Financial Instruments - Financial Instruments (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 5,941,000,000	$ 5,915,000,000
Short-term Investments	732,000,000	248,000,000
Cash [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	764,000,000	876,000,000
Time Deposits [Member] | Remaining maturities from 1 to 90 days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	4,520,000,000	3,509,000,000
Short-term Investments	42,000,000	0
Commercial Paper [Member] | Remaining maturities from 1 to 90 days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	247,000,000	229,000,000
Short-term Investments	690,000,000	248,000,000
US Government Debt Securities [Member] | Remaining maturities from 1 to 90 days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	410,000,000	1,301,000,000
Short-term Investments	$ 0	$ 0

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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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