Income Taxes - Schedule of Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets
Other Employee Benefit Plans	$ 105	$ 106
Other	553	499
Total	658	605
Liabilities
Accelerated Depreciation	7,600	7,366
Other	627	622
Total	8,227	7,988
Net Deferred Income Tax Liabilities	$ 7,569	$ 7,383