Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Net earnings allocated to common shares	$ 5,701	$ 6,905	$ 7,042
Amortization period of differences between the expected long-term return on plan assets and the actual return	5 years
Equity method investments carrying value	$ 141