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Employee Benefit Plans (Reconciliation of Projected Benefit Obligations and Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S.
Change in Benefit Obligation
Benefit obligation at January 1	$ 2,791	$ 2,895
Service cost	127	124	$ 121
Interest cost	116	109	108
Plan participant contributions	0	0
Actuarial loss (gain)	62	(25)
Benefits paid	(215)	(312)
Curtailment gain	0	0
Acquisition of a business	0	0
Foreign currency exchange rate change	0	0
Benefit obligation at December 31	2,881	2,791	2,895
Change in Fair Value of Plan Assets
Fair value of plan assets at January 1	2,023	2,124
Actual return on plan assets	136	(10)
Company contributions	330	221
Plan participant contributions	0	0
Benefits paid	(215)	(312)
Foreign currency exchange rate change	0	0
Fair value of plan assets at December 31	2,274	2,023	2,124
Funded Status at December 31	(607)	(768)
Int’l.
Change in Benefit Obligation
Benefit obligation at January 1	912	941
Service cost	32	38	38
Interest cost	28	28	35
Plan participant contributions	3	3
Actuarial loss (gain)	237	(10)
Benefits paid	(19)	(20)
Curtailment gain	(31)	0
Acquisition of a business	0	0
Foreign currency exchange rate change	(107)	(68)
Benefit obligation at December 31	1,055	912	941
Change in Fair Value of Plan Assets
Fair value of plan assets at January 1	742	724
Actual return on plan assets	148	18
Company contributions	40	63
Plan participant contributions	3	3
Benefits paid	(19)	(20)
Foreign currency exchange rate change	(118)	(46)
Fair value of plan assets at December 31	796	742	724
Funded Status at December 31	(259)	(170)
Other Benefits
Change in Benefit Obligation
Benefit obligation at January 1	219	203
Service cost	7	7	7
Interest cost	8	7	8
Plan participant contributions	2	1
Actuarial loss (gain)	(6)	13
Benefits paid	(13)	(12)
Curtailment gain	0	0
Acquisition of a business	8	0
Foreign currency exchange rate change	0	0
Benefit obligation at December 31	225	219	203
Change in Fair Value of Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Company contributions	11	11
Plan participant contributions	2	1
Benefits paid	(13)	(12)
Foreign currency exchange rate change	0	0
Fair value of plan assets at December 31	0	0	$ 0
Funded Status at December 31	$ (225)	$ (219)

X

- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The amount of increase in the benefit obligation attributed to business combinations.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contributions made by the employer to defined benefit plans.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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