Leases (Schedule of Right-of-use Assets and Lease Liabilities) (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Right-of-use assets, finance lease		$ 209	$ 211
Finance lease liabilities:
Current lease liabilities, finance lease	[1]	8	8
Long-term lease liabilities, finance lease		247	247
Total lease liabilities, finance lease		255	255
Right-of-use assets, operating lease		20	24
Operating lease liabilities:
Current lease liabilities, operating lease	[1]	15	18
Long-term lease liabilities, operating lease		4	5
Total lease liabilities, operating lease		19	23
Right-of-use assets		229	235
Lease liabilities:
Current lease liabilities	[1]	23	26
Long-term lease liabilities		251	252
Total lease liabilities		$ 274	$ 278

[1] Current lease liabilities are included in other current liabilities on the consolidated balance sheets.