Revenue Recognition Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	$ 1,126	$ 1,209
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	29	13
Other Significant Noncash Transaction, Value of Consideration Received	2	3
Contract with Customer, Liability, Revenue Recognized	(64)	(54)
Contract with Customer, Liability - End of Period	$ 1,093	$ 1,171