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Equity and Share-Based Compensation (Weighted Average Common Shares Outstanding) (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity [Abstract]        
Weighted average number of common shares outstanding – basic (in shares) 4,601 4,570 4,596 4,566
Effect of dilutive securities (in shares) 72 37 73 45
Weighted-average number of common shares outstanding – diluted (in shares) 4,673 4,607 4,669 4,611