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Information on Business Segments - Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2021 USD ($) segment | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) retiree | Dec. 31, 2021 USD ($) $ / shares | Aug. 03, 2021 USD ($) | Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of business segments |  | 4 |  | 4 |  |  |
Equity method investments | $ 689 | $ 689 | $ 689 | $ 689 | $ 689 |  | $ 784
Non-cash, non-operating pension settlement charge | 1,700 |  | 1,700 |  |  |  |
Non-cash, non-operating pension settlement charge, after tax | $ 1,300 |  | $ 1,300 |  |  |  |
Non-cash, non-operating pension settlement charge, per share, after tax (in dollars per share) | $ / shares | $ 4.72 |  |  |  | $ 4.72 |  |
Outstanding pension benefit obligations and related plan assets |  |  |  |  |  | $ 4,900 |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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