Fair Value Measurements - Investments and Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets:
Common stock and equivalents	$ 69	$ 19
Recurring | Common stock and equivalents
Assets:
Common stock and equivalents	69	19
Recurring | Foreign exchange derivative contracts
Assets:
Foreign exchange derivative contracts	7	14
Liabilities:
Foreign exchange derivative contracts	5	8
Level 1 | Recurring | Common stock and equivalents
Assets:
Common stock and equivalents	69	19
Level 1 | Recurring | Foreign exchange derivative contracts
Assets:
Foreign exchange derivative contracts	0	0
Liabilities:
Foreign exchange derivative contracts	0	0
Level 2 | Recurring | Common stock and equivalents
Assets:
Common stock and equivalents	0	0
Level 2 | Recurring | Foreign exchange derivative contracts
Assets:
Foreign exchange derivative contracts	7	14
Liabilities:
Foreign exchange derivative contracts	$ 5	$ 8