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Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2021

Jun. 30, 2020

Jun. 30, 2021

Jun. 30, 2020

Dec. 31, 2020

Disaggregation of Revenues [Abstract]

Revenues from contracts with customers

$ 396

$ 617

$ 1,093

$ 1,576

Other revenues

19

33

37

56

Operating revenues and other

415

650

1,130

1,632

Deferred Revenue [Abstract]

Deferred revenue

4,309

4,309

$ 4,023

Revenue recognized

624

574

Performance Obligations [Abstract]

Remaining performance obligations

13,300

13,300

Receivables [Member]

Receivables from Contracts with Customers [Abstract]

Receivables from contracts with customers

106

106

246

Other Liabilities [Member]

Deferred Revenue [Abstract]

Deferred revenue

4,400

4,400

$ 4,100

CNA Financial [Member] | Non-Insurance Warranty [Member]

Disaggregation of Revenues [Abstract]

Revenues from contracts with customers

359

308

697

609

Boardwalk Pipelines [Member] | Transportation and Storage of Natural Gas and NGLs and Other Services [Member]

Disaggregation of Revenues [Abstract]

Revenues from contracts with customers

302

286

663

618

Loews Hotels & Co [Member] | Lodging and Related Services [Member]

Disaggregation of Revenues [Abstract]

Revenues from contracts with customers

94

16

150

158

Corporate [Member] | Rigid Plastic Packaging and Recycled Resin [Member]

Disaggregation of Revenues [Abstract]

Revenues from contracts with customers

^[1]

244

280

500

Diamond Offshore [Member] | Contract Drilling [Member]

Disaggregation of Revenues [Abstract]

Revenues from contracts with customers

^[2]

$ 71

$ 300

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01

Performance Obligations [Abstract]

Remaining performance obligations

$ 1,200

$ 1,200

Expected timing of satisfaction

6 months

6 months

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01

Performance Obligations [Abstract]

Remaining performance obligations

$ 2,200

$ 2,200

Expected timing of satisfaction

1 year

1 year

[1]	Revenues presented for Corporate reflect the periods prior to the deconsolidation of Altium Packaging in the second quarter of 2021. See Note 2 for further discussion.
[2]	Revenues presented for Diamond Offshore reflect the periods prior to its deconsolidation. in the second quarter of 2020. See Note 2 for further discussion.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer, excluding non-insurance warranty revenue, and revenue classified as other. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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