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Long-term Employee Benefits (Cash Flows Defined Benefit Plans) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2020		$ 13
2021		9
2022		10
2023		13
2024		15
2025 to 2029		87
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 19	$ 15	$ 38
Estimated future employer contributions in next fiscal year			$ 18
U.S. Pension Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer				$ 10
Cash payment to settle remaining liability	$ 10

X

- 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.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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