Weighted Average Shares Outstanding (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

	Year Ended December 31,
(in millions)	2020	2019	2018
Weighted average shares outstanding - basic	1,416.7	1,391.5	1,381.0
Net effect of common stock equivalents	—	19.0	20.4
Weighted average shares outstanding - assuming dilution	1,416.7	1,410.6	1,401.4

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following securities were excluded from the calculation of weighted average shares outstanding - assuming dilution because their effect in the periods presented below would have been antidilutive:

	Year Ended December 31,
(in millions)	2020	2019	2018
Common stock equivalents(1)	14	n/a	n/a
Stock options outstanding(2)	6	0	0
MCPS(3)	14	n/a	n/a

(1)    Represents common stock equivalents pursuant to our employee stock-based compensation plans, which are anti-dilutive in 2020 due to our Net loss position in this period.

(2)    Represents stock options outstanding pursuant to our employee stock-based compensation plans with exercise prices that were greater than the average fair market value of our common stock for the related periods.

(3)    Represents common stock issuable upon the conversion of MCPS. Refer to Note L – Stockholders' Equity for additional information.