Preferred and Common Stock (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of Share Activity

Share Activity (number of shares)

	Common stock
	Treasury		Outstanding
Balance at end of 2014	87,150,169		1,216,663,661
Issued for stock-based compensation plans	(6,099,066	)	6,099,066
Acquisition of RTI	—		87,397,414
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

Schedule of Activity for Stock Options and Stock Awards

The activity for stock options and stock awards during 2017 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, 2017	13		$	24.14	8		$	22.26
Granted	2		21.13		3		21.86
Exercised	(2	)	20.65		—		—
Converted	—		—		(2	)	24.95
Expired or forfeited	(2	)	25.99		(2	)	21.26
Performance share adjustment	—		—		—		21.48
Outstanding, December 31, 2017	11		23.94		7		21.49