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Summary of Significant Accounting Policies - Consolidated Statement of Operations (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and casualty insurance claims and claims expense |  |  |  |  |  |  |  |  | $ 23,976,000,000 | $ 22,778,000,000 | $ 21,847,000,000 |  |
Operating costs and expenses |  |  |  |  |  |  |  |  | 5,690,000,000 | 5,594,000,000 | 5,196,000,000 |  |
Pension and other postretirement remeasurement gains and losses |  |  |  |  |  |  |  |  | 114,000,000 | 468,000,000 | (217,000,000) |  |
Restructuring and related charges |  |  |  |  |  |  |  |  | 41,000,000 | 67,000,000 | 96,000,000 |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 38,592,000,000 | 37,193,000,000 | 34,878,000,000 |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 6,089,000,000 | 2,628,000,000 | 4,549,000,000 |  |
Income tax expense |  |  |  |  |  |  |  |  | 1,242,000,000 | 468,000,000 | 995,000,000 |  |
Net income |  |  |  |  |  |  |  |  | 4,847,000,000 | 2,160,000,000 | 3,554,000,000 |  |
Net Income (Loss) Available to Common Stockholders, Basic | $ 1,707,000,000 | $ 889,000,000 | $ 821,000,000 | $ 1,261,000,000 | $ (585,000,000) | $ 942,000,000 | $ 678,000,000 | $ 977,000,000 | $ 4,678,000,000 | $ 2,012,000,000 | $ 3,438,000,000 |  |
Net income applicable to common shareholders earnings per common share - Basic (in dollars per share) | $ 5.32 | $ 2.71 | $ 2.47 | $ 3.79 | $ (1.71) | $ 2.72 | $ 1.94 | $ 2.76 | $ 14.25 | $ 5.78 | $ 9.50 |  |
Net income applicable to common shareholders earnings per common share - Diluted (in dollars per share) | $ 5.23 | $ 2.67 | $ 2.44 | $ 3.74 | $ (1.71) | $ 2.68 | $ 1.91 | $ 2.71 | $ 14.03 | $ 5.70 | $ 9.35 |  |
Impact of merger | $ 25,998,000,000 |  |  |  | $ 21,312,000,000 |  |  |  | $ 25,998,000,000 | $ 21,312,000,000 | $ 22,551,000,000 |  |
Change in accounting principle |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic | $ 240,000,000 | $ (140,000,000) | $ (69,000,000) | $ 5,000,000 | $ (273,000,000) | $ 109,000,000 | $ 41,000,000 | $ 31,000,000 |  |  |  |  |
Net income applicable to common shareholders earnings per common share - Basic (in dollars per share) | $ 0.75 | $ (0.43) | $ (0.21) | $ 0.01 | $ (0.80) | $ 0.31 | $ 0.12 | $ 0.09 |  |  |  |  |
Net income applicable to common shareholders earnings per common share - Diluted (in dollars per share) | $ 0.73 | $ (0.42) | $ (0.20) | $ 0.02 | $ (0.80) | $ 0.31 | $ 0.11 | $ 0.08 |  |  |  |  |
Previously reported |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and casualty insurance claims and claims expense |  |  |  |  |  |  |  |  | 24,074,000,000 | 22,839,000,000 | 21,929,000,000 |  |
Operating costs and expenses |  |  |  |  |  |  |  |  | 5,752,000,000 | 5,869,000,000 | 5,442,000,000 |  |
Pension and other postretirement remeasurement gains and losses |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Restructuring and related charges |  |  |  |  |  |  |  |  | 41,000,000 | 83,000,000 | 109,000,000 |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 38,638,000,000 | 37,077,000,000 | 35,436,000,000 |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 6,043,000,000 | 2,744,000,000 | 3,991,000,000 |  |
Income tax expense |  |  |  |  |  |  |  |  | 1,232,000,000 | 492,000,000 | 802,000,000 |  |
Net income |  |  |  |  |  |  |  |  | 4,811,000,000 | 2,252,000,000 | 3,189,000,000 |  |
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  | $ 4,642,000,000 | $ 2,104,000,000 | $ 3,073,000,000 |  |
Net income applicable to common shareholders earnings per common share - Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 14.14 | $ 6.05 | $ 8.49 |  |
Net income applicable to common shareholders earnings per common share - Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 13.92 | $ 5.96 | $ 8.36 |  |
Impact of merger | $ 26,156,000,000 |  |  |  | $ 21,312,000,000 |  |  |  | $ 26,156,000,000 | $ 21,312,000,000 |  |  |
Change in accounting principle | Change in accounting principle |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and casualty insurance claims and claims expense |  |  |  |  |  |  |  |  | (98,000,000) | (61,000,000) | $ (82,000,000) |  |
Operating costs and expenses |  |  |  |  |  |  |  |  | (62,000,000) | (275,000,000) | (246,000,000) |  |
Pension and other postretirement remeasurement gains and losses |  |  |  |  |  |  |  |  | 114,000,000 | 468,000,000 | (217,000,000) |  |
Restructuring and related charges |  |  |  |  |  |  |  |  | 0 | (16,000,000) | (13,000,000) |  |
Total costs and expenses |  |  |  |  |  |  |  |  | (46,000,000) | 116,000,000 | (558,000,000) |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 46,000,000 | (116,000,000) | 558,000,000 |  |
Income tax expense |  |  |  |  |  |  |  |  | 10,000,000 | (24,000,000) | 193,000,000 |  |
Net income |  |  |  |  |  |  |  |  | 36,000,000 | (92,000,000) | 365,000,000 |  |
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  | $ 36,000,000 | $ (92,000,000) | $ 365,000,000 |  |
Net income applicable to common shareholders earnings per common share - Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.11 | $ (0.27) | $ 1.01 |  |
Net income applicable to common shareholders earnings per common share - Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.11 | $ (0.26) | $ 0.99 |  |
Impact of merger | $ (158,000,000) |  |  |  | $ 0 |  |  |  | $ (158,000,000) | $ 0 |  | $ (41,000,000) | $ 0

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