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Investments in Equity Securities (Investment in ABI Narrative) (Details) - ABI [Member] - USD ($) shares in Millions, $ in Millions |  | 9 Months Ended
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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%)

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