Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Redeemable Noncontrolling Interests and Redeemable Subsidiary Preferred Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative effects of adoption of accounting standards	Treasury Stock at Cost	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Class A Common Stock Common Stock	Class B Common Stock Common Stock
Balance, beginning of year at Dec. 31, 2018		$ 1,316
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of subsidiary preferred stock		0
Contributions from (distributions to) noncontrolling interests, net		(62)
Other		(38)
Net income (loss)		156
Balance, end of year at Dec. 31, 2019		1,372
Balance, beginning of year at Dec. 31, 2018			$ 37,461	$ 41,983	$ 0		$ (368)	$ 889	$ 54	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans			783
Repurchases of common stock under repurchase program and employee plans			(34)	(485)					0
Employee stock purchase plans			222
Dividends declared				(3,860)
Other comprehensive income (loss)							1,415	(13)
Contributions from (distributions to) noncontrolling interests, net								176
Other			15	0				(14)
Net income (loss)	$ 13,057			13,057
Net income (loss)								110
Balance, end of year at Dec. 31, 2019	$ 83,874		38,447	50,695	(124)	$ (7,517)	1,047	1,148	54	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per common share (in dollars per share)	$ 0.84
Redemption of subsidiary preferred stock		0
Contributions from (distributions to) noncontrolling interests, net		(51)
Other		(190)
Net income (loss)		149
Balance, end of year at Dec. 31, 2020	$ 1,280	1,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans			920
Repurchases of common stock under repurchase program and employee plans			(143)	(407)					0
Employee stock purchase plans			255
Dividends declared				(4,250)
Other comprehensive income (loss)							837	60
Contributions from (distributions to) noncontrolling interests, net								192
Other			(15)	(10)				(3)
Net income (loss)	10,534			10,534
Net income (loss)								18
Balance, end of year at Dec. 31, 2020	$ 91,738		39,464	56,438	$ 0	(7,517)	1,884	1,415	54	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per common share (in dollars per share)	$ 0.92
Redemption of subsidiary preferred stock		(725)
Contributions from (distributions to) noncontrolling interests, net		(77)
Other		(10)
Net income (loss)		51
Balance, end of year at Dec. 31, 2021	$ 519	$ 519
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans			1,037
Repurchases of common stock under repurchase program and employee plans			(596)	(4,088)					0
Employee stock purchase plans			269
Dividends declared				(4,613)
Other comprehensive income (loss)							(404)	7
Contributions from (distributions to) noncontrolling interests, net								353
Other			(2)	6				0
Net income (loss)	14,159			14,159
Net income (loss)								(377)
Balance, end of year at Dec. 31, 2021	$ 97,490		$ 40,173	$ 61,902		$ (7,517)	$ 1,480	$ 1,398	$ 54	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per common share (in dollars per share)	$ 1.00