Consolidated Statements of Changes in Shareholder's Equity - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Noncontrolling interests	Adjustment to adopt new accounting guidance	Adjustment to adopt new accounting guidance Retained earnings	Adjustment to adopt new accounting guidance Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2018	$ 2,849	$ 745	$ 2	$ 2,874	$ (925)	$ 153
Balance (Accounting Standards Update 2018-02) at Dec. 31, 2018							$ 0	$ (97)	$ 97
Increase (Decrease) in Shareholder's Equity [Roll Forward]
Profit of consolidated companies	323			306		17
Foreign currency translation, net of tax	(132)				(127)	(5)
Derivative financial instruments, net of tax	(41)				(41)
Balance at Sep. 30, 2019	2,999	745	2	3,083	(996)	165
Balance at Jun. 30, 2019	3,034	745	2	2,954	(831)	164
Increase (Decrease) in Shareholder's Equity [Roll Forward]
Profit of consolidated companies	135			129		6
Foreign currency translation, net of tax	(165)				(160)	(5)
Derivative financial instruments, net of tax	(5)				(5)
Balance at Sep. 30, 2019	2,999	745	2	3,083	(996)	165
Balance at Dec. 31, 2019	3,236	745	2	3,162	(845)	172
Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019							$ (13)	$ (13)
Increase (Decrease) in Shareholder's Equity [Roll Forward]
Profit of consolidated companies	210			197		13
Foreign currency translation, net of tax	(32)				(35)	3
Derivative financial instruments, net of tax	21				21
Balance at Sep. 30, 2020	3,422	745	2	3,346	(859)	188
Balance at Jun. 30, 2020	3,212	745	2	3,298	(1,012)	179
Increase (Decrease) in Shareholder's Equity [Roll Forward]
Profit of consolidated companies	52			48		4
Foreign currency translation, net of tax	150				145	5
Derivative financial instruments, net of tax	8				8
Balance at Sep. 30, 2020	$ 3,422	$ 745	$ 2	$ 3,346	$ (859)	$ 188