Tax Matters (Tax Contingencies) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Income Tax Contingency [Line Items]
Net liabilities associated with uncertain tax positions		$ 192		$ 188		$ 187
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(189)	[1]	(188)	[1]	(182)
Decreases based on tax positions taken during a prior period	[2]	9		7		6
Increases based on tax positions taken during the current period	[2]	(4)		(9)		(9)
Settlements		7		0		0
Lapse in statute of limitations(a)		3		2		3
Balance, December 31	[1]	(194)		(189)		(188)
Net interest expense		4		1		2
Gross accrued interest		16		12		11
Gross accrued penalties		3		3		3
Other Noncurrent Assets [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(3)		(3)
Balance, December 31		(11)		(3)		(3)
Noncurrent Deferred Tax Assets
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(1)		(1)
Balance, December 31		(2)		(1)		(1)
Other Taxes Payable
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(188)		(187)
Increases based on tax positions taken during a prior period	[2]	(20)		(1)		(6)
Balance, December 31		$ (192)		$ (188)		$ (187)

[1] In 2022, included in Noncurrent deferred tax assets and Other noncurrent assets ($2 million) and Other taxes payable ($192 million). In 2021, included in Noncurrent deferred tax assets and Other noncurrent assets ($1 million) and Other taxes payable ($188 million). In 2020, included in Noncurrent deferred tax assets and Other noncurrent assets ($1 million) and Other taxes payable ($187 million).

[2] Primarily included in Provision for taxes on income.