Income Tax (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Proceeds from Income Tax Refunds	$ 20	$ 59	$ 22
Cash paid for income taxes	388	167	66
Decrease in Unrecognized Tax Benefits is Reasonably Possible	5
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	50
Cash paid for income taxes	388	167	66
Deferred Tax Assets, Valuation Allowance	218	251
Proceeds from Income Tax Refunds	20	59	22
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability	1,800	2,700
Subsidiary Net Operating Loss		20
Operating Loss Carryforwards	920
Unrecognized Tax Benefits	34	342	333	$ 325
Unrecognized Tax Benefits, Interest on Income Taxes Expense	(31)	(11)	$ (12)
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3	$ 34
Foreign Tax Authority | Revenue Commissioners, Ireland
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 26