Annual report pursuant to Section 13 and 15(d)

Earnings Per Common Share - Narrative (Details)

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Earnings Per Common Share - Narrative (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Stock Option      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from computation of earnings per share (in shares)   4,000,000 21
Series L Preferred Stock | Convertible Preferred Stock Subject to Mandatory Redemption      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from computation of earnings per share (in shares) 62 62 62
Common Stock | Warrant      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from computation of earnings per share (in shares)     122
Dilutive Securities      
Incremental common shares attributable to dilutive effect of call options and warrants (in shares) 3,000,000 136 143