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Investments in Equity Securities (Investment in ABI Narrative) (Details) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Fair value of equity investment | $ 11,200,000,000 | $ 11,200,000,000 |
Equity method investment, difference between carrying amount and underlying equity | $ 14,000,000 | $ 14,000,000 | $ 77,000,000
ABI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 10.00% | 10.00% |
Number of restricted shares owned (in shares) | 185 | 185 |
Number of ordinary shares owned (in shares) | 12 | 12 |
Restricted shares, lock-up period |  | 5 years |
Investments in equity securities | $ 11,237,000,000 | $ 11,237,000,000 | $ 16,651,000,000
Difference between carrying amount and fair value, percentage (approximately) |  | 35.00% | 17.00%
Equity method investment, impairment | $ 6,157,000,000 | $ 6,157,000,000 | $ 0
Equity method investment, reduction in share price, percentage | 18.00% | 18.00% |
Equity method investment, difference between carrying amount and underlying equity | $ 5,100,000,000 | $ 5,100,000,000 |
Fair Value, Inputs, Level 1 [Member] | ABI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair value of equity investment |  |  | $ 13,800,000,000

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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