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General - Statement of Operations (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Property and casualty insurance claims and claims expense | $ 6,356,000,000 | $ 5,777,000,000 | $ 12,176,000,000 | $ 10,906,000,000 |  |  |  |  |  |
Operating costs and expenses | 1,380,000,000 | 1,358,000,000 | 2,760,000,000 | 2,661,000,000 |  |  |  |  |  |
Pension and other postretirement remeasurement gains and losses | 125,000,000 | (7,000,000) | 140,000,000 | 7,000,000 |  |  |  |  |  |
Restructuring and related charges | 9,000,000 | 23,000,000 | 27,000,000 | 42,000,000 |  |  |  |  |  |
Total costs and expenses | 10,068,000,000 | 9,204,000,000 | 19,439,000,000 | 17,712,000,000 |  |  |  |  |  |
Gain on disposition of operations | (2,000,000) | (2,000,000) | (3,000,000) | (3,000,000) |  |  |  |  |  |
Income from operations before income tax expense | 1,078,000,000 | 897,000,000 | 2,698,000,000 | 2,160,000,000 |  |  |  |  |  |
Income tax expense | 227,000,000 | 180,000,000 | 555,000,000 | 437,000,000 |  |  |  |  |  |
Net income | 851,000,000 | 717,000,000 | 2,143,000,000 | 1,723,000,000 |  |  |  |  |  |
Preferred stock dividends | 30,000,000 | 39,000,000 | 61,000,000 | 68,000,000 |  |  |  |  |  |
Net income applicable to common shareholders | $ 821,000,000 | $ 678,000,000 | $ 2,082,000,000 | $ 1,655,000,000 |  |  |  |  |  |
Net income available to common shareholders per common share - Basic (in dollars per share) | $ 2.47 | $ 1.94 | $ 6.27 | $ 4.71 |  |  |  |  |  |
Net income available to common shareholders per common share - Diluted (in dollars per share) | $ 2.44 | $ 1.91 | $ 6.17 | $ 4.63 |  |  |  |  |  |
Stockholders' equity | $ 24,476,000,000 | $ 23,122,000,000 | $ 24,476,000,000 | $ 23,122,000,000 |  |  | $ 21,312,000,000 |  |  |
Previously reported |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Property and casualty insurance claims and claims expense | 6,376,000,000 | 5,792,000,000 | 12,205,000,000 | 10,941,000,000 |  |  |  |  |  |
Operating costs and expenses | 1,401,000,000 | 1,384,000,000 | 2,789,000,000 | 2,717,000,000 |  |  |  |  |  |
Pension and other postretirement remeasurement gains and losses | 0 |  | 0 |  |  |  |  |  |  |
Restructuring and related charges | 5,000,000 | 27,000,000 | 27,000,000 | 49,000,000 |  |  |  |  |  |
Total costs and expenses | 9,980,000,000 | 9,256,000,000 | 19,357,000,000 | 17,803,000,000 |  |  |  |  |  |
Income from operations before income tax expense | 1,166,000,000 | 845,000,000 | 2,780,000,000 | 2,069,000,000 |  |  |  |  |  |
Income tax expense | 246,000,000 | 169,000,000 | 573,000,000 | 418,000,000 |  |  |  |  |  |
Net income | 920,000,000 | 676,000,000 | 2,207,000,000 | 1,651,000,000 |  |  |  |  |  |
Net income applicable to common shareholders | $ 890,000,000 | $ 637,000,000 | $ 2,146,000,000 | $ 1,583,000,000 |  |  |  |  |  |
Net income available to common shareholders per common share - Basic (in dollars per share) | $ 2.68 | $ 1.82 | $ 6.46 | $ 4.50 |  |  |  |  |  |
Net income available to common shareholders per common share - Diluted (in dollars per share) | $ 2.64 | $ 1.80 | $ 6.36 | $ 4.43 |  |  |  |  |  |
Stockholders' equity | $ 24,703,000,000 | $ 23,122,000,000 | $ 24,703,000,000 | $ 23,122,000,000 |  |  |  |  |  |
Impact of change | Impact of change |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Property and casualty insurance claims and claims expense | (20,000,000) | (15,000,000) | (29,000,000) | (35,000,000) |  |  |  |  |  |
Operating costs and expenses | (21,000,000) | (26,000,000) | (29,000,000) | (56,000,000) |  |  |  |  |  |
Pension and other postretirement remeasurement gains and losses | 125,000,000 |  | 140,000,000 |  |  |  |  |  |  |
Restructuring and related charges | 4,000,000 | (4,000,000) | 0 | (7,000,000) |  |  |  |  |  |
Total costs and expenses | 88,000,000 | (52,000,000) | 82,000,000 | (91,000,000) |  |  |  |  |  |
Income from operations before income tax expense | (88,000,000) | 52,000,000 | (82,000,000) | 91,000,000 |  |  |  |  |  |
Income tax expense | (19,000,000) | 11,000,000 | (18,000,000) | 19,000,000 |  |  |  |  |  |
Net income | (69,000,000) | 41,000,000 | (64,000,000) | 72,000,000 |  |  |  |  |  |
Net income applicable to common shareholders | $ (69,000,000) | $ 41,000,000 | $ (64,000,000) | $ 72,000,000 |  |  |  |  |  |
Net income available to common shareholders per common share - Basic (in dollars per share) | $ (0.21) | $ 0.12 | $ (0.19) | $ 0.21 |  |  |  |  |  |
Net income available to common shareholders per common share - Diluted (in dollars per share) | $ (0.20) | $ 0.11 | $ (0.19) | $ 0.20 |  |  |  |  |  |
Stockholders' equity | $ (227,000,000) | $ 0 | $ (227,000,000) | $ 0 |  |  |  |  | $ 0 |
Retained income |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net income | 851,000,000 | 717,000,000 | 2,143,000,000 | 1,723,000,000 |  |  |  |  |  |
Stockholders' equity | 45,803,000,000 | 43,997,000,000 | 45,803,000,000 | 43,997,000,000 |  | $ 45,148,000,000 | 44,033,000,000 | $ 43,479,000,000 |  | $ 41,579,000,000
Retained income | Previously reported |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net income | 920,000,000 | 676,000,000 | 2,207,000,000 | 1,651,000,000 |  |  |  |  |  |
Stockholders' equity | 47,542,000,000 | 45,508,000,000 | 47,542,000,000 | 45,508,000,000 |  | 46,818,000,000 | 45,708,000,000 | 45,031,000,000 |  | 43,162,000,000
Retained income | Impact of change | Impact of change |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net income | (69,000,000) | 41,000,000 | (64,000,000) | 72,000,000 |  |  |  |  |  |
Stockholders' equity | (1,739,000,000) | (1,511,000,000) | (1,739,000,000) | (1,511,000,000) | $ (18,000,000) | (1,670,000,000) | (1,675,000,000) | (1,552,000,000) | (1,580,000,000) | (1,583,000,000)
Accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 1,760,000,000 | 243,000,000 | 1,760,000,000 | 243,000,000 |  | 1,085,000,000 | 118,000,000 | 398,000,000 |  | 1,889,000,000
Accumulated other comprehensive income | Previously reported |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 248,000,000 | (1,268,000,000) | 248,000,000 | (1,268,000,000) |  | (566,000,000) | (1,557,000,000) | (1,150,000,000) |  | 306,000,000
Accumulated other comprehensive income | Impact of change | Impact of change |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ 1,512,000,000 | $ 1,511,000,000 | $ 1,512,000,000 | $ 1,511,000,000 | $ 18,000,000 | $ 1,651,000,000 | $ 1,675,000,000 | $ 1,548,000,000 | $ 1,580,000,000 | $ 1,583,000,000

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