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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EARNINGS PER SHARE      
Earnings from continuing operations allocated to common shares $ 4,449 $ 3,666 $ 2,320
Net earnings allocated to common shares $ 4,473 $ 3,666 $ 2,353