Description of Business and Summary of Significant Accounting Policies - Schedule of Cumulative Effect for Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 71,993	$ 60,464		$ 53,147	$ 43,952	$ 43,542
Noncontrolling interests	$ 1,410	$ 1,430			1,566	$ 1,565
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings					410
Noncontrolling interests					$ 1
Opening balance sheet adjustment (Note 1)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			$ (200)
Adjusted opening balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			$ 52,947