Earnings Per Share - Weighted Average Numbers of Anti-Dilutive Shares (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common stock (in shares)	171	11	57
Stock-based compensation awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common stock (in shares)	20	11	21
CEC Convertible Notes (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common stock (in shares)	151	0	36