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Marketable and Other Securities Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Marketable Securities [Line Items]
Cash and cash equivalents	$ 17,176	$ 20,844
Total	20,781	23,496	$ 17,547	$ 17,848
Other assets [Member]
Marketable Securities [Line Items]
Restricted cash	237	$ 260
Continuing Operations [Member]
Marketable Securities [Line Items]
Cash and cash equivalents	17,176
Total	20,781
Continuing Operations [Member] | Other current assets [Member]
Marketable Securities [Line Items]
Restricted cash	3,063
Continuing Operations [Member] | Other assets [Member]
Marketable Securities [Line Items]
Restricted cash	$ 542

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- Definition

Fair value portion 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.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

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