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Preferred and Common Stock - Schedule of Activity for Stock Options and Stock Awards (Detail)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Schedule Of Stock Option Activity [Line Items]  
Number of options, Exercised (8,900,000)
Stock Options [Member]  
Schedule Of Stock Option Activity [Line Items]  
Number of options, Outstanding beginning of year 11,000,000
Number of options, Granted 3,000,000
Number of options, Exercised 0
Converted 0
Number of options, Expired or forfeited 0
Number of options, Cancelled due to Separation Transaction (4,000,000)
Number of options, Adjustment due to Separation Transaction 3,000,000
Number of options, Performance share adjustment 0
Number of options, Outstanding end of year 13,000,000
Weighted average exercise price, Outstanding beginning of year | $ / shares $ 35.72
Weighted average exercise price, granted | $ / shares 20.22
Weighted average exercise price, exercised | $ / shares 26.89
Weighted average exercise price, Converted | $ / shares 0
Weighted average exercise price, expired or forfeited | $ / shares 36.75
"Weighted average exercise price, Cancelled due to Separation Transaction | $ / shares $ 32.70
"Weighted average exercise price, Adjustment due to Separation Transaction 24.14
Weighted average exercise price, Performance share adjustment | $ / shares $ 0
Weighted average exercise price Outstanding, end of year | $ / shares $ 24.14
Stock Awards [Member]  
Schedule Of Stock Option Activity [Line Items]  
Number of awards, Outstanding beginning of year 7,000,000
Number of awards, Granted 4,000,000
Number of awards, Exercised 0
Number of awards, Converted (3,000,000)
Number of awards, Expired or forfeited 0
Number of awards, Cancelled due to Separation Transaction (2,000,000)
Number of awards, Adjustment due to Separation Transaction 2,000,000
Number of awards, Performance share adjustment 0
Number of awards, Outstanding end of year 8,000,000
Weighted average FMV per award, Outstanding beginning of year | $ / shares $ 34.13
Weighted average FMV per award, Granted | $ / shares 20.64
Weighted average FMV per award, Exercised | $ / shares 0
Weighted average FMV per award, Converted | $ / shares 26.72
Weighted average FMV per award, Expired or forfeited | $ / shares 31.90
Weighted average FMV per award, Expired or forfeited,Cancelled due to Separation Transaction | $ / shares 30.46
Weighted average FMV per award, Expired or forfeited,Adjustment due to Separation Transaction | $ / shares 22.20
Weighted average FMV per award, Performance share adjustment | $ / shares 20.87
Weighted average FMV per award, Outstanding, end of year | $ / shares $ 22.26