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Investments in Equity Securities (Summary of Financial Data in ABI) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                      
Net revenues $ 6,304 $ 7,123 $ 6,367 $ 6,359 $ 6,007 $ 6,856 $ 6,619 $ 5,628 $ 26,153 $ 25,110 $ 25,364
Gross profit 3,146 3,717 3,287 2,873 3,084 3,497 3,319 2,811 13,023 12,711 12,254
Earnings from continuing operations                 6,890 766 9,341
Net earnings 1,922 (956) $ 1,938 $ 1,550 (1,814) (2,602) $ 1,997 $ 1,121 4,454 (1,298) 6,967
Net earnings attributable to ABI                 (13) (5) 4
Total current assets 7,117       4,824       7,117 4,824  
Current liabilities 9,063       8,174       9,063 8,174  
Noncontrolling interests $ 40       $ 38       40 38  
ABI [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Net revenues                 48,294 54,187 55,500
Gross profit                 28,438 33,735 34,986
Earnings from continuing operations                 4,265 10,530 9,020
Net earnings                 4,266 10,530 9,020
Net earnings attributable to ABI                 $ 3,323 $ 9,189 $ 7,641
Total current assets   28,672       27,353          
Long-term assets   185,106       199,591          
Current liabilities   34,884       36,819          
Long-term liabilities   117,400       119,025          
Noncontrolling interests   $ 8,459       $ 8,765