Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Retained earnings	Accumulated other comprehensive income/(loss)	Common stock	Noncontrolling interest
Beginning Balance at Mar. 31, 2022	$ 19,452	$ 16,901	$ (38)	$ 1,366	$ 1,223
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	864	791			73
Other comprehensive income (loss)	(194)		(101)		(93)
Dividends declared	(829)	(766)			(63)
Ending Balance at Dec. 31, 2022	19,293	16,926	(139)	1,366	1,140
Beginning Balance at Mar. 31, 2023	19,025	16,688	(135)	1,366	1,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	875	825			50
Other comprehensive income (loss)	48		25		23
Dividends declared	(1,004)	(970)			(34)
Ending Balance at Dec. 31, 2023	$ 18,944	$ 16,543	$ (110)	$ 1,366	$ 1,145