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Nature of Operations and Significant Accounting Policies (Details) $ in Millions				1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 28, 2021	Jun. 18, 2021 shares	Jun. 04, 2021	Apr. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) state mi	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) state mi	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Mar. 26, 2021 USD ($) property phase	Dec. 31, 2020 USD ($)
Revenue from External Customer [Line Items]
Number of rail route miles | mi						19,500		19,500
Number of states rail network serves | state						23		23
Gain recognized on property dispositions						$ 60	$ 4	$ 430	$ 33
Proceeds from property dispositions								297	$ 51
Stock split conversion ratio	3		3
Number of additional shares of common stock received for each share held after stock split (in shares) | shares		2
Reclassification to other capital						(11,455)		(11,455)				$ (11,259)	[1]
Reclassification from retained earnings						24		24		$ 0		152	[1]
Revision of Prior Period, Reclassification, Adjustment | Stock split reclassification adjustment
Revenue from External Customer [Line Items]
Reclassification to other capital										1,000
Reclassification from retained earnings										$ 1,000
Non-Freight Receivables
Revenue from External Customer [Line Items]
Receivable recorded from sale of property						402		402				$ 224
Virginia Line Segments
Revenue from External Customer [Line Items]
Number of property rights for sale | property											3
Number of phases to complete property rights sale transaction | phase											3
Total sale price											$ 525
Gain recognized on property dispositions				$ 349
Proceeds from property dispositions				$ 200
Virginia Line Segments | Subsequent Event | Forecast
Revenue from External Customer [Line Items]
Proceeds from property dispositions					$ 200
Virginia Line Segments | Non-Freight Receivables
Revenue from External Customer [Line Items]
Receivable recorded from sale of property						$ 168		$ 168
[1] Certain prior year data has been retroactively adjusted to reflect the stock split effective June 28, 2021 or reclassified to conform to the current presentation. See accompanying notes to consolidated financial statements.

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