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Summary of Significant Accounting Policies - Consolidated Statements of Financial Position (Details) - USD ($) | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained income | $ 48,074,000,000 |  | $ 44,033,000,000 |  |
Unrealized foreign currency translation adjustments | (59,000,000) |  | (49,000,000) |  |
Unamortized pension and other postretirement prior service credit | 122,000,000 |  | 169,000,000 |  |
Total AOCI | 1,950,000,000 |  | 118,000,000 |  |
Total shareholders’ equity | 25,998,000,000 |  | 21,312,000,000 |  | $ 22,551,000,000
Previously reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained income | 49,713,000,000 |  | 45,708,000,000 |  |
Unrealized foreign currency translation adjustments | (68,000,000) |  | (64,000,000) |  |
Unamortized pension and other postretirement prior service credit | (1,350,000,000) |  | (1,491,000,000) |  |
Total AOCI | 469,000,000 |  | (1,557,000,000) |  |
Total shareholders’ equity | 26,156,000,000 |  | 21,312,000,000 |  |
Impact of change | Impact of change |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained income | (1,639,000,000) |  | (1,675,000,000) |  |
Unrealized foreign currency translation adjustments | 9,000,000 |  | 15,000,000 |  |
Unamortized pension and other postretirement prior service credit | 1,472,000,000 |  | 1,660,000,000 |  |
Total AOCI | 1,481,000,000 |  | 1,675,000,000 |  |
Total shareholders’ equity | $ (158,000,000) | $ (41,000,000) | $ 0 | $ 0 |

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