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Investments in Equity Securities (Investment in ABI Narrative) (Details) - ABI [Member] - USD ($)
shares in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 10.00%  
Number of restricted shares owned (in shares) 185  
Number of ordinary shares owned (in shares) 12  
Restricted shares, lock-up period 5 years  
Investments in equity securities $ 17,185,000,000 $ 16,651,000,000
Difference between carrying amount and fair value, percentage (approximately) 17.00% 17.00%
Equity method investment, impairment $ 0 $ 0
Fair Value, Inputs, Level 1 [Member]    
Schedule of Equity Method Investments [Line Items]    
Fair value of equity investment $ 14,200,000,000 $ 13,800,000,000