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Employee Benefit Plans - Textual (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 01, 2017
Employee Benefit Plans (Textual) [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax		$ 187,000,000		$ 13,000,000	$ 145,000,000	$ (26,000,000)
U.S.
Employee Benefit Plans (Textual) [Abstract]
Company contributions					150,000,000
Expected company contributions		160,000,000			160,000,000
U.S. | Qualified Plan [Member]
Employee Benefit Plans (Textual) [Abstract]
Pension settlement expense		14,000,000			161,000,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax			$ 42,000,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.20%		4.20%					3.60%
U.S. | Qualified Plan [Member] | Prudential Benefit Obligation [Member]
Employee Benefit Plans (Textual) [Abstract]
Change In Defined Benefit Assets	$ 700,000,000
Change In Defined Benefit Obligation	$ 700,000,000
Int'l (Pension Benefits) [Member]
Employee Benefit Plans (Textual) [Abstract]
Company contributions					130,000,000
Expected company contributions		160,000,000			$ 160,000,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax		$ (157,000,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.95%			2.95%		2.55%
Int'l (Pension Benefits) [Member] | Qualified Plan [Member]
Employee Benefit Plans (Textual) [Abstract]
Reclassification of Pension Liability		$ 146,000,000			$ 146,000,000

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- Definition

Change In Defined Benefit Assets caused by funding of annuity.

+ References

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Employee benefit plans.

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Reclassification of Pension Liability to Other Assets.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

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- Definition

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

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Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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