Condensed Consolidated Statement of Stockholders' Equity Statement - USD ($) $ in Millions	Total	Treasury stock	Accumulated other comprehensive income (loss)	Retained earnings	Capital in excess of par value	Common Stock
Balance at beginning of period at Dec. 31, 2017	$ 9,641	$ (6,462)	$ 12	$ 13,832	$ 1,451	$ 808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(500)	500	0	0	0	0
Issuance of common and treasury stock pursuant to Employee stock plans	(4)	(5)	0	0	9	0
Share-based compensation	10	0	0	0	10	0
Cash dividends	(75)	0	0	75	0	0
Comprehensive income	547	0	84	463	0	0
Balance at end of period at Mar. 31, 2018	9,619	(6,957)	78	14,238	1,452	808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting standards	0	0	(18)	18	0	0
Balance at beginning of period at Dec. 31, 2018	9,853	(8,452)	20	15,967	1,510	808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(500)	500	0	0	0	0
Issuance of common and treasury stock pursuant to Employee stock plans	(4)	(6)	0	0	10	0
Share-based compensation	13	0	0	0	13	0
Cash dividends	(89)	0	0	89	0	0
Comprehensive income	463	0	76	387	0	0
Balance at end of period at Mar. 31, 2019	9,791	(8,946)	96	16,320	1,513	808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting standards	$ 55	$ 0	$ 0	$ 55	$ 0	$ 0