Commitments and Contingencies (Schedule of Future Obligation under Transportation Agreements) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Other Commitments [Line Items]
Total	$ 10,456
Less than 1 Year	1,144
1 to 3 Years	2,046
3 to 5 Years	1,894
5 to 8 Years	2,416
More than 8 Years	2,956
Infrastructure currently in service
Other Commitments [Line Items]
Total	9,584
Less than 1 Year	1,141
1 to 3 Years	1,932
3 to 5 Years	1,731
5 to 8 Years	2,167
More than 8 Years	2,613
Pending regulatory approval and/or construction
Other Commitments [Line Items]
Total	872
Less than 1 Year	3
1 to 3 Years	114
3 to 5 Years	163
5 to 8 Years	249
More than 8 Years	$ 343