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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

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- Definition

The amount of net income (loss) from continuing operations allocated to common shares during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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