STOCKHOLDERS' EQUITY STATEMENTS - USD ($) $ in Millions	Total	Common stock and paid-in capital	Retained earnings	Retained earnings Cumulative effect of accounting changes	Accumulated other comprehensive income	Accumulated other comprehensive income Cumulative effect of accounting changes
Balance, beginning of period at Jun. 30, 2019		$ 78,520	$ 24,150	$ 0	$ (340)	$ 0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member
Common stock issued		1,003
Net income	$ 33,079		33,079
Other comprehensive income (loss)	3,016				3,016
Common stock cash dividends	(11,627)		(11,627)
Common stock repurchased		(3,649)	(13,590)
Stock-based compensation expense		3,940
Other, net		(1)
Balance, end of period at Mar. 31, 2020	$ 114,501	79,813	32,012		2,676
Cash dividends declared per common share	$ 1.53
Balance, beginning of period at Dec. 31, 2019		79,625	30,739	0	(255)	0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member
Common stock issued		342
Net income	$ 10,752		10,752
Other comprehensive income (loss)	2,931				2,931
Common stock cash dividends	(3,865)		(3,865)
Common stock repurchased		(1,492)	(5,614)
Stock-based compensation expense		1,338
Other, net		0
Balance, end of period at Mar. 31, 2020	$ 114,501	79,813	32,012		2,676
Cash dividends declared per common share	$ 0.51
Balance, beginning of period at Jun. 30, 2020	$ 118,304	80,552	34,566	(32)	3,186	10
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member
Common stock issued		1,513
Net income	$ 44,813		44,813
Other comprehensive income (loss)	(1,734)				(1,734)
Common stock cash dividends	(12,670)		(12,665)
Common stock repurchased		(4,322)	(15,947)
Stock-based compensation expense		4,547
Other, net		18
Balance, end of period at Mar. 31, 2021	$ 134,505	82,308	50,735		1,462
Cash dividends declared per common share	$ 1.68
Balance, beginning of period at Dec. 31, 2020		81,896	44,973	$ 0	3,367	$ 0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member
Common stock issued		396
Net income	$ 15,457		15,457
Other comprehensive income (loss)	(1,905)				(1,905)
Common stock cash dividends	(4,219)		(4,214)
Common stock repurchased		(1,528)	(5,481)
Stock-based compensation expense		1,525
Other, net		19
Balance, end of period at Mar. 31, 2021	$ 134,505	$ 82,308	$ 50,735		$ 1,462
Cash dividends declared per common share	$ 0.56