Condensed Consolidated Statements of Shareholders' Equity (Parentheticals) - USD ($) shares in Millions, $ in Millions		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Treasury shares held in trust (in shares)		1	1	1	1	1	1	1		1
Treasury shares held in trust value		$ 29	$ 29	$ 29	$ 29	$ 29	$ 31	$ 31		$ 31
Common stock par value		17	$ 17	$ 17	17	$ 17	$ 17	$ 17		$ 17
Adoption of new accounting standard	[1]								$ 13
Decrease to accumulated other comprehensive income		(950)			(102)
Increase to retained earnings		$ 44,017			$ 40,911
Accounting Standards Update 2014-09
Adoption of new accounting standard									13
Accounting Standards Update 2018-02
Adoption of new accounting standard									7
Decrease to accumulated other comprehensive income									7
Increase to retained earnings									$ 7

[1] Reflects the adoption of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, which resulted in a reduction to retained earnings of $13 million and the adoption of ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which resulted in a reduction to accumulated other comprehensive income of $7 million and an increase to retained earnings of $7 million, each during the three months ended March 31, 2018.