Fair Value of Financial Assets and Liabilities - Recurring (Details) - Fair Value, Recurring - Significant Other Observable Inputs (Level 2) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets:
Total	$ 25	$ 22
Liabilities:
Total	22	26
Options Held
Assets:
Foreign currency options	1	0
Foreign exchange contracts – forwards
Assets:
Total	6	2
Liabilities:
Total	5	8
Interest rate swaps
Assets:
Total	0	1
Deferred compensation
Assets:
Total	18	19
Liabilities:
Total	$ 17	$ 18