Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Common stock	Treasury stock	Profit employed in the business	Accumulated other comprehensive income (loss)	Noncontrolling interests
Balance at Dec. 31, 2017	$ 13,766	$ 5,593	$ (17,005)	$ 26,301	$ (1,192)	$ 69
Adjustments to adopt new accounting guidance | Revenue recognition	(12)	0	0	(12)	0	0
Adjustments to adopt new accounting guidance | Tax accounting for intra-entity asset transfers	(35)	0	0	(35)	0	0
Adjustments to adopt new accounting guidance | Recognition and measurement of financial assets and liabilities	0	0	0	11	(11)	0
Balance at Jan. 01, 2018	13,719	5,593	(17,005)	26,265	(1,203)	69
Balance at Dec. 31, 2017	13,766	5,593	(17,005)	26,301	(1,192)	69
Increase (Decrease) in Shareholders' Equity
Profit of consolidated and affiliated companies	1,667	0	0	1,665	0	2
Foreign currency translation, net of tax	184	0	0	0	184	0
Pension and other postretirement benefits, net of tax	(9)	0	0	0	(9)	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	23	0	0	0	23	0
Available-for-sale securities, net of tax	(11)	0	0	0	(11)	0
Change in Ownership for Noncontrolling Interests	3	(2)	0	0	0	5
Dividends declared	(1)	0	0	(1)	0	0
Common shares issued from treasury stock for stock-based compensation: 3,426,757 in 2018 and 1,859, 065 in 2019	149	(9)	158	0	0	0
Stock-based compensation expense, before tax (in dollars)	50	50	0	0	0	0
Common shares repurchased: 3,147,629 in 2018 and 5,699,525 in 2019	(500)	0	(500)	0	0	0
Other	4	4	0	0	0	0
Balance at Mar. 31, 2018	15,272	5,640	(17,347)	27,929	(1,016)	66
Balance at Dec. 31, 2018	14,080	5,827	(20,531)	30,427	(1,684)	41
Adjustments to adopt new accounting guidance | Accounting Standards Update 2018-02 [Member]	0	0	0	(108)	108	0
Adjustments to adopt new accounting guidance | Accounting Standards Update 2016-02	235	0	0	235	0	0
Balance at Jan. 01, 2019	14,315	5,827	(20,531)	30,554	(1,576)	41
Balance at Dec. 31, 2018	14,080	5,827	(20,531)	30,427	(1,684)	41
Increase (Decrease) in Shareholders' Equity
Profit of consolidated and affiliated companies	1,884	0	0	1,881	0	3
Foreign currency translation, net of tax	(22)	0	0	0	(22)	0
Pension and other postretirement benefits, net of tax	(7)	0	0	0	(7)	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1	0	0	0	1	0
Available-for-sale securities, net of tax	16	0	0	0	16	0
Distribution to noncontrolling interests	(1)	0	0	0	0	(1)
Common shares issued from treasury stock for stock-based compensation: 3,426,757 in 2018 and 1,859, 065 in 2019	(5)	(73)	68	0	0	0
Stock-based compensation expense, before tax (in dollars)	45	45	0	0	0	0
Common shares repurchased: 3,147,629 in 2018 and 5,699,525 in 2019	(751)	0	(751)	0	0	0
Other	3	5	0	0	0	(2)
Balance at Mar. 31, 2019	$ 15,478	$ 5,804	$ (21,214)	$ 32,435	$ (1,588)	$ 41