Preferred and Common Stock (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Share Activity

Share Activity (number of shares)

	Common stock
	Treasury		Outstanding
Balance at end of 2015	81,051,103		1,310,160,141
Issued for stock-based compensation plans	(5,219,660	)	5,302,128
Treasury stock retirement	(75,831,443	)	—
Reverse Stock Split	—		(876,942,489	)
Balance at end of 2016	—		438,519,780
Conversion of convertible notes	—		39,242,706
Issued for stock-based compensation plans	—		3,654,051
Balance at end of 2017	—		481,416,537
Issued for stock-based compensation plans	—		1,854,180
Balance at end of 2018	—		483,270,717

Schedule of Activity for Stock Options and Stock Awards

The activity for stock options and stock awards during 2018 was as follows (options and awards in millions):

	Stock options				Stock awards
	Number of options		Weighted average exercise price		Number of awards		Weighted average FMV per award
Outstanding, January 1, 2018	11		$	23.94	7		$	21.49
Granted	1		29.97		2		26.48
Exercised	(1	)	18.95		—		—
Converted	—		—		(1	)	32.75
Expired or forfeited	(1	)	26.96		(1	)	21.10
Performance share adjustment	—		—		—		18.47
Outstanding, December 31, 2018	10		$	24.95	7		$	21.13