Equity (Changes in Common Stock) (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding at beginning of period	4,571,211,797	4,544,000,000	4,517,000,000
Stock compensation plans	21,000,000	20,000,000	21,000,000
Repurchases and retirements of common stock	(73,000,000)
Employee stock purchase plans	5,000,000	7,000,000	6,000,000
Common stock, shares outstanding at end of period	4,523,785,950	4,571,211,797	4,544,000,000
Class B Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding at beginning of period	9,444,375	9,000,000	9,000,000
Stock compensation plans	0	0	0
Repurchases and retirements of common stock	0
Employee stock purchase plans	0	0	0
Common stock, shares outstanding at end of period	9,444,375	9,444,375	9,000,000