Income Taxes - Schedule of Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Pension Plans	$ 2	$ 62
Other Employee Benefit Plans	106	96
Other	497	320
Total	605	478
Liabilities
Accelerated Depreciation	7,366	7,195
Other	622	451
Total	7,988	7,646
Net Deferred Income Tax Liabilities	$ 7,383	$ 7,168