Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	$ 2,236	$ 2,088
Amounts recognized in consolidated balance sheets:
Non-current liabilities	(333)	(264)
Retirement Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Net benefit obligation at beginning of year	2,004	2,171
Service cost	5	10	24
Interest cost	99	91	93
Plan participant's contributions	0	0
Actuarial loss (gain)	504	(178)
Gross benefits paid	(125)	(77)
Foreign currency effect	(25)	8
Curtailment	0	(26)
Other adjustments	0	5
Net benefit obligation at end of year	2,462	2,004	2,171
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	2,088	1,851
Actual return on plan assets	270	281
Employer contributions	22	27
Plan participant's contributions	0	0
Gross benefits paid	(125)	(77)
Foreign currency effect	(19)	6
Fair value of plan assets at end of year	2,236	2,088	1,851
Funded status	(226)	84
Amounts recognized in consolidated balance sheets:
Non-current assets	28	261
Current liabilities	(8)	(7)
Non-current liabilities	(246)	(170)
Amounts Recognized in Consolidated Balance Sheet, Total	(226)	84
Accumulated benefit obligation	2,440	2,004
Plans with accumulated benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation	2,046	176
Accumulated benefit obligation	2,024	158
Fair value of plan assets	1,792	0
Amounts recognized in accumulated other comprehensive loss, net of tax:
Net actuarial loss (gain)	452	227
Prior service credit	1	1
Total recognized	453	228
Postretirement Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Net benefit obligation at beginning of year	103	129
Service cost	1	2	3
Interest cost	4	5	5
Plan participant's contributions	4	4
Actuarial loss (gain)	5	(13)
Gross benefits paid	(13)	(13)
Foreign currency effect	0	0
Curtailment	0	(11)
Other adjustments	(8)	0
Net benefit obligation at end of year	96	103	129
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	9	9
Plan participant's contributions	4	4
Gross benefits paid	(13)	(13)
Foreign currency effect	0	0
Fair value of plan assets at end of year	0	0	0
Funded status	(96)	(103)
Amounts recognized in consolidated balance sheets:
Non-current assets	0	0
Current liabilities	(9)	(9)
Non-current liabilities	(87)	(94)
Amounts Recognized in Consolidated Balance Sheet, Total	(96)	(103)
Amounts recognized in accumulated other comprehensive loss, net of tax:
Net actuarial loss (gain)	(8)	(11)
Prior service credit	(5)	(1)
Total recognized	$ (13)	$ (12)

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Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Net of Tax.

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Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Net of Tax.

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Defined benefit plan other adjustments.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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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.

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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.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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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 increase in the fair value of plan assets from contributions made by the employer.

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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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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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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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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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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.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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