Pension Plans and Other Post Employment Benefit Plans Pension Plans with Projected Benefit Obligations in Excess of Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligations	$ 20,788	$ 23,261	[1]
Fair Value of plan assets	$ 16,716	18,669	[2]
Discontinued Operations [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligations		3,800
Fair Value of plan assets		$ 2,600

[1] Includes $3.8 billion of discontinued operations for the period ended December 31, 2018.

[2] Includes $2.6 billion of discontinued operations for the period ended December 31, 2018.