Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - Fair value, recurring - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets
Total assets	$ 173	$ 252
Liabilities
Total liabilities	1	2
Commodity Contract [Member]
Assets
Total assets	171	251
Interest Rate Contract [Member]
Assets
Total assets	2	1
Liabilities
Total liabilities	1	2
Level 1
Assets
Total assets	0	0
Liabilities
Total liabilities	0	0
Level 1 | Commodity Contract [Member]
Assets
Total assets	0	0
Level 1 | Interest Rate Contract [Member]
Assets
Total assets	0	0
Liabilities
Total liabilities	0	0
Level 2
Assets
Total assets	2	1
Liabilities
Total liabilities	1	2
Level 2 | Commodity Contract [Member]
Assets
Total assets	0	0
Level 2 | Interest Rate Contract [Member]
Assets
Total assets	2	1
Liabilities
Total liabilities	1	2
Level 3
Assets
Total assets	171	251
Liabilities
Total liabilities	0	0
Level 3 | Commodity Contract [Member]
Assets
Total assets	171	251
Level 3 | Interest Rate Contract [Member]
Assets
Total assets	0	0
Liabilities
Total liabilities	$ 0	$ 0