Tax Matters (Tax Contingencies) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Income Tax Contingency [Line Items]
Net liabilities associated with uncertain tax positions		$ 209		$ 192		$ 188
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(194)	[1]	(189)	[1]	(188)
Decreases based on tax positions taken during a prior period	[2]	20		9		7
Increases based on tax positions taken during the current period	[2]	(13)		(4)		(9)
Settlements		0		7		0
Lapse in statute of limitations(a)		5		3		2
Balance, December 31	[1]	(209)		(194)		(189)
Net interest expense		10		4		1
Gross accrued interest		26		16		12
Gross accrued penalties		1		3		3
Other Noncurrent Assets [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(11)		(3)
Balance, December 31		0		(11)		(3)
Noncurrent Deferred Tax Assets
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(2)		(1)
Balance, December 31				(2)		(1)
Other Taxes Payable
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1		(192)		(188)
Increases based on tax positions taken during a prior period	[2]	(27)		(20)		(1)
Balance, December 31		$ (209)		$ (192)		$ (188)

[1] In 2023, included in Other taxes payable ($209 million). 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).

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