Investments in Equity Securities (Investment in ABI Narrative) (Details) - ABI [Member] - USD ($) shares in Millions, $ in Millions		9 Months Ended
Dec. 31, 2018	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		10.10%
Number of restricted shares owned (in shares)		185
Number of ordinary shares owned (in shares)		12
Fair value of equity investment	$ 13,100	$ 18,800
Investments in equity securities	$ 17,696	$ 17,950
Difference between carrying amount and fair value, percentage	(26.00%)	(4.00%)

Equity Method Investment, Difference Between Carrying Amount and Fair Value, Percentage

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Equity Method Investment, Number of Shares Owned, Common

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Fair value portion of investments accounted under the equity method.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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