Pension and Postretirement Expense Level 4 (Details) - Non-U.S. Pension Plan Investments Measured at Fair Value - Foreign Plan [Member] - Pension Plan [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pooled Insurance Products with Fixed Income Guarantee	$ 12	$ 11
Pension Benefits Fair Value of Plan Assets of Underfunded Plans	12	391
Fair value of plan assets at end of year subtotal	12	11
Other international equity funds	77	90
Other fixed income securities	315	311
Defined Benefit Plan, Plan Assets, Amount	404	412	$ 349
Fair Value, Inputs, Level 1 [Member]
Pooled Insurance Products with Fixed Income Guarantee	0	0
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 2 [Member]
Pooled Insurance Products with Fixed Income Guarantee	12	11
Defined Benefit Plan, Plan Assets, Amount	12	11
Fair Value, Inputs, Level 3 [Member]
Pooled Insurance Products with Fixed Income Guarantee	0	0
Defined Benefit Plan, Plan Assets, Amount	$ 0	$ 0