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Retirement and Deferred Compensation Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit expense (recovery) | $ 8 | $ (2) | $ (3)
Expected benefit payments in the next fiscal year | 110 |  |
Defined contribution plans expense | 104 | 93 | 88
Deferred compensation plans expense | 28 | 4 | $ 35
Elective Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension contributions | $ 2 | $ 8 |

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- Definition Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
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