Consolidated Statements of Shareholders' Equity (Parentheticals) - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2021	Dec. 31, 2020
Treasury shares held in trust (in shares)		1				1	1
Treasury shares held in trust		$ 29				$ 29	$ 29
Common stock		17				17	17
Cumulative adjustment to retained earnings as a result of new accounting standard adoption		$ 64,170		$ 58,543		75,381	69,701
ASU 2016-02
Accounting Standards Update [Extensible List]				ASU 2016-02
ASU 2016-13
Accounting Standards Update [Extensible List]		ASU 2016-13
Retained Earnings
Cumulative adjustment to retained earnings as a result of new accounting standard adoption		$ 45,108		$ 40,911		$ 54,906	$ 49,640
Cumulative Effect, Period of Adoption, Adjustment
Cumulative adjustment to retained earnings as a result of new accounting standard adoption		(3)	[1]	178	[2]
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Cumulative adjustment to retained earnings as a result of new accounting standard adoption	[1]	(3)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | ASU 2016-02
Cumulative adjustment to retained earnings as a result of new accounting standard adoption	[2]			$ 178
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | ASU 2016-13
Cumulative adjustment to retained earnings as a result of new accounting standard adoption		$ (3)

[1] Reflects the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), which resulted in a reduction to retained earnings of $3 million during the year ended December 31, 2020.

[2] 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 year ended December 31, 2019.