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Retirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Defined Benefit Plan Disclosure |  |  |  |
Actual contribution to defined benefit pension plans |  |  | $ 10 |
Pension settlement loss |  |  | 0 | $ (26)
US | Pension benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Defined benefit plan, benefit obligation, payment for settlement |  | $ 50 |  |
Liquidation of plan assets |  | 50 |  |
Decrease in benefit obligation |  | 63 |  |
Pension settlement loss | $ 0 | (26) | 0 | $ (26)
US | Pension benefits | Former Employees |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Defined benefit plan, benefit obligation, benefits paid |  | $ 13 |  |
Minimum |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Defined benefit plan, expected future employer contributions, current fiscal year | 15 |  | 15 |
Maximum |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Defined benefit plan, expected future employer contributions, current fiscal year | $ 20 |  | $ 20 |

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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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