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Employee Benefit Plans - Narrative (Details) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) shares
Compensation and Retirement Disclosure [Abstract] |  |
Number of days used to compute performance period average closing price of restricted stock units |  | 20 days
RSUs |  |
Compensation and Retirement Disclosure [Abstract] |  |
Awards granted (in shares) | shares |  | 1.1
Vesting period |  | 3 years
Time-Vested RSUs |  |
Compensation and Retirement Disclosure [Abstract] |  |
Awards granted (in shares) | shares |  | 0.8
Performance-Based RSUs |  |
Compensation and Retirement Disclosure [Abstract] |  |
Awards granted (in shares) | shares |  | 0.3
Pension Benefits |  |
Compensation and Retirement Disclosure [Abstract] |  |
Employer contribution to tax-qualified defined benefit pension plans | $ 335 | $ 635
Retiree Medical Benefits |  |
Compensation and Retirement Disclosure [Abstract] |  |
Discount rate | 3.39% | 3.39%
Decrease in projected benefit obligation due to plan amendment and remeasurement | $ 421 |
Offset to other comprehensive loss related to prior service credits | 597 |
Actuarial loss | $ 176 |
Amortization period | 7 years |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -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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