Condensed Consolidated Statements of Shareholders' Equity (Parentheticals) - USD ($) shares in Millions, $ in Millions		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Treasury shares held in trust (in shares)		1	1	1		1
Treasury shares held in trust value		$ 29	$ 29	$ 29		$ 29
Common stock par value		$ 17	$ 17	$ 17		$ 17
Accounting Standards Update 2016-02
Adoption of new accounting standard	[1]				$ 178
Retained Earnings | Accounting Standards Update 2016-02
Adoption of new accounting standard	[1]				$ 178

[1] Reflects the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842), which resulted in an increase to retained earnings of $178 million during the three months ended March 31, 2019.