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Preferred and Common Stock - Schedule of Activity for Stock Options and Stock Awards (Details)
shares in Millions
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of awards, outstanding beginning of year (in shares) | shares 7
Number of awards, granted (in shares) | shares 2
Number of awards, exercised (in shares) | shares 0
Number of awards, converted (in shares) | shares (1)
Number of awards, expired or forfeited (in shares) | shares (1)
Number of awards, performance share adjustment (in shares) | shares 0
Number of awards, outstanding end of year (in shares) | shares 7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted average FMV per award, outstanding beginning of year (in usd per share) | $ / shares $ 21.49
Weighted average FMV per award, granted (in usd per share) | $ / shares 26.48
Weighted average FMV per award, exercised (in usd per share) | $ / shares 0.00
Weighted average FMV per award, converted (in usd per share) | $ / shares 32.75
Weighted average FMV per award, expired or forfeited (in usd per share) | $ / shares 21.10
Weighted average FMV per award, performance share adjustment (in usd per share) | $ / shares 18.47
Weighted average FMV per award, outstanding, end of year (in usd per share) | $ / shares $ 21.13
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Number of options outstanding at the beginning of the year (in shares) | shares 11
Number of options granted (in shares) | shares 1
Number of options exercised (in shares) | shares (1)
Number of options converted (in shares) | shares 0
Number of options expired or forfeited (in shares) | shares (1)
Performance share adjustment (in shares) | shares 0
Number of options outstanding at the end of the year (in shares) | shares 10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted average exercise price, outstanding beginning of year (in usd per share) | $ / shares $ 23.94
Weighted average exercise price, granted (in usd per share) | $ / shares 29.97
Weighted average exercise price, exercised (in usd per share) | $ / shares 18.95
Weighted average exercise price, converted (in usd per share) | $ / shares 0.00
Weighted average exercise price, expired or forfeited (in usd per share) | $ / shares 26.96
Weighted average exercise price, performance share adjustment (in usd per share) | $ / shares 0.00
Weighted average exercise price, outstanding end of year (in usd per share) | $ / shares $ 24.95