Description of Business and Significant Accounting Policies Description of Business and Significant Accounting Policies - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Contract liabilities	$ 516	$ 507
Contract with Customer, Liability, Noncurrent	69	80
Contract with Customer, Liability, Revenue Recognized	447	$ 407
Average Amount of Vault Cash	$ 4,400