Leases (Summary of Supplemental Balance Sheet Information Related to Operating Leases) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets:
Operating lease assets	$ 470	$ 366
Liabilities:
Current lease liabilities	$ 58	$ 37
Current lease liability, statement of financial position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Non-current lease liabilities	$ 478	$ 386
Total lease liabilities	$ 536	$ 423