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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Computation of basic and diluted EPS The table below sets forth the computation of basic and diluted EPS:
Year ended December 31
202020192018
Basic EPS Calculation
Earnings available to common stockholders - Basic1
$(5,543)$2,924 $14,824 
Weighted-average number of common shares outstanding2
1,870 1,882 1,897 
Add: Deferred awards held as stock units
— — 1 
Total weighted-average number of common shares outstanding1,870 1,882 1,898 
Earnings per share of common stock - Basic$(2.96)$1.55 $7.81 
Diluted EPS Calculation
Earnings available to common stockholders - Diluted1
$(5,543)$2,924 $14,824 
Weighted-average number of common shares outstanding2
1,870 1,882 1,897 
Add: Deferred awards held as stock units
— — 1 
Add: Dilutive effect of employee stock-based awards
— 13 16 
Total weighted-average number of common shares outstanding1,870 1,895 1,914 
Earnings per share of common stock - Diluted$(2.96)$1.54 $7.74 
1 There was no effect of dividend equivalents paid on stock units or dilutive impact of employee stock-based awards on earnings.
2 Millions of shares; 1 million shares of employee-based awards were not included in the 2020 diluted EPS calculation as the result would be anti-dilutive.