Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Liabilities:
Differences between book and tax basis of property	$ (961)	$ (1,308)
Deferred Tax Liabilities, Investment in US Tax Partnerships	(629)	(332)
Deferred income taxes	977	1,100
Other taxable temporary differences	(418)	(403)
Deferred Tax Liabilities, Gross	(2,008)	(2,043)
Deferred Tax Assets:
Operating loss carryforwards	979	1,156
Capital loss carryforwards	77	73
Bad debt and other book provisions	380	87
Tax credit carryforwards	68	78
Other deductible temporary differences	464	471
Total gross deferred tax asset	1,968	1,865
Less: Valuation allowance	(528)	(634)
Total net deferred tax asset	1,440	1,231
Total deferred tax liability	$ (568)	$ (812)