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Employee Benefit Plans - Plan Asset Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Pension Plans Defined Benefit [Member] | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 2,161 | $ 1,969
Defined Benefit Plan, Actual Return on Plan Assets | 273 | (112)
Insurance Contract Rights And Obligations Fair Value Option [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Of Participating Interest In Annuity Contract | 95 | 84
Insurance Contract Rights And Obligations Fair Value Option [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans Defined Benefit [Member] | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Of Participating Interest In Annuity Contract | 95 | 84
Accumulated benefit obligation | 140 | 144
Defined Benefit Plan, Actual Return on Plan Assets | (4) |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) | $ 7 |
Defined Benefit Plan, Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations for plan assets | 37.00% |
Defined Benefit Plan, Debt Security [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations for plan assets | 56.00% |
Defined Benefit Plan, Debt Security [Member] | Insurance Contract Rights And Obligations Fair Value Option [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans Defined Benefit [Member] | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Of Participating Interest In Annuity Contract | $ 235 | $ 228
Defined Benefit Plan, Real Estate [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations for plan assets | 6.00% |
Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations for plan assets | 1.00% |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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