Summary of Significant Accounting Policies - Recently Issued Accounting Standards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Research and Development
Research and development expense	$ 191	$ 134	$ 143
Recently issued accounting standards
ROU assets	496	390
Lease liabilities	531
Total equity	4,434	3,828	3,601	$ 3,372
Cumulative Effect, Period of Adoption, Adjustment
Recently issued accounting standards
Total equity			(3)
Cumulative Effect, Period of Adoption, Adjustment | Allowance for Credit Losses
Recently issued accounting standards
Total equity			3
Retained Earnings
Recently issued accounting standards
Total equity	$ 4,847	$ 4,287	4,030	$ 3,770
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Recently issued accounting standards
Total equity			$ (3)
Designated as hedge
Derivative commodity instruments
Number of derivative agreements | item	0