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
Cumulative effect of new accounting standards	$ 55	$ 0	$ 0	$ 55	$ 0	$ 0
Balance at beginning of period at Dec. 31, 2018	9,853	(8,452)	20	15,967	1,510	808
Balance at beginning of period (Accounting Standards Update 2016-02) at Dec. 31, 2018	9,908	(8,452)	20	16,022	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 (loss)	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
Balance at beginning of period at Dec. 31, 2019	9,832	(10,441)	(61)	17,945	1,581	808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(451)	(451)	0	0	0	0
Issuance of common and treasury stock pursuant to Employee stock plans	2	6	0	0	8	0
Share-based compensation	(9)	0	0	0	(9)	0
Cash dividends	(94)	0	0	(94)	0	0
Comprehensive income (loss)	(219)	0	(125)	(94)	0	0
Balance at end of period at Mar. 31, 2020	$ 9,075	$ (10,886)	$ (186)	$ 17,757	$ 1,582	$ 808