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Employee Benefit Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Employee Benefit Plans [Line Items] |  |  |  |
Increase (decrease) in accumulated other comprehensive gains (losses) | $ (250) | $ (304) | $ 292 | $ (294)
Number of days used to compute performance period average closing price of restricted stock units |  |  | 20 days |
RSUs |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Awards granted (in shares) |  |  | 2.4 |
Vesting period |  |  | 3 years |
Time-Vested RSUs |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Awards granted (in shares) |  |  | 2.1 |
Performance-Based RSUs |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Awards granted (in shares) |  |  | 0.3 |
Pension Benefits |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Special termination benefit | (19) | 0 | $ (54) | 0
Settlement loss for VSPs | $ (319) | 0 | $ (390) | 0
Discount rate | 3.01% |  | 3.01% |
Increase (decrease) in the projected benefit obligation |  |  | $ (380) |
Increase (decrease) in accumulated other comprehensive gains (losses) |  |  | (286) |
Other Postretirement Benefits |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Special termination benefit | $ (76) | 0 | (201) | 0
Settlement loss for VSPs | $ 0 | $ 0 | $ 0 | $ 0
Discount rate | 2.61% |  | 2.61% |
Retiree Medical Benefit Program |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |
Increase (decrease) in the projected benefit obligation |  |  | $ 270 |
Increase (decrease) in accumulated other comprehensive gains (losses) |  |  | $ (69) |

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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due To Settlement, Restructuring + References No definition available. + Details
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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due To Special And Contractual Termination Benefits + References No definition available. + Details
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- Definition The time period over which the stock closing prices are averaged to arrive at a per-share valuation for equity based awards such as Restricted Stock Units, Performance Share and other equity based awards. + References No definition available. + Details
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- Definition [Line Items] for Employee Benefit Plans [Table] + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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