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Employee Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined contribution plans [Abstract]
Company contributions to all defined contribution plans expensed	$ 644us-gaap_DefinedContributionPlanCostRecognized		$ 497us-gaap_DefinedContributionPlanCostRecognized		$ 370us-gaap_DefinedContributionPlanCostRecognized
Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums	65 years
Change in benefit obligation [Roll Forward]
APBO at beginning of period	138us-gaap_DefinedBenefitPlanBenefitObligation		148us-gaap_DefinedBenefitPlanBenefitObligation
Service cost	10us-gaap_DefinedBenefitPlanServiceCost		30us-gaap_DefinedBenefitPlanServiceCost		20us-gaap_DefinedBenefitPlanServiceCost
Interest cost	7us-gaap_DefinedBenefitPlanInterestCost		4us-gaap_DefinedBenefitPlanInterestCost		4us-gaap_DefinedBenefitPlanInterestCost
Benefits paid	(4)us-gaap_DefinedBenefitPlanBenefitsPaid		(3)us-gaap_DefinedBenefitPlanBenefitsPaid
Actuarial gain	21us-gaap_DefinedBenefitPlanActuarialGainLoss		(41)us-gaap_DefinedBenefitPlanActuarialGainLoss
Settlements	(3)us-gaap_DefinedBenefitPlanSettlementsBenefitObligation		0us-gaap_DefinedBenefitPlanSettlementsBenefitObligation
APBO at end of period	169us-gaap_DefinedBenefitPlanBenefitObligation		138us-gaap_DefinedBenefitPlanBenefitObligation		148us-gaap_DefinedBenefitPlanBenefitObligation
Effect of a one percentage point change in assumed health care cost trend rates [Abstract]
Increase in total service and interest costs	3us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
Increase in the APBO	24us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Decrease in total service and interest costs	(2)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Decrease in the APBO	(20)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
Estimated future benefit payments time period [Abstract]
2015	5us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
2016	6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
2017	7us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
2018	7us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
2019	8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
Next five years thereafter	55us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
Reconciliation of funded status to accrued postretirement benefit cost recognized on the balance sheet [Abstract]
Funded status	(169)us-gaap_DefinedBenefitPlanFundedStatusOfPlan		(138)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Unrecognized net actuarial gain	(53)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax		(80)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
Unrecognized prior service cost	12us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax		15us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
Accumulated other comprehensive income	41us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax		65us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Cost recognized on Consolidated Balance Sheet	(169)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet		(138)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Components of periodic postretirement benefit cost [Abstract]
Service cost	10us-gaap_DefinedBenefitPlanServiceCost		30us-gaap_DefinedBenefitPlanServiceCost		20us-gaap_DefinedBenefitPlanServiceCost
Interest cost	7us-gaap_DefinedBenefitPlanInterestCost		4us-gaap_DefinedBenefitPlanInterestCost		4us-gaap_DefinedBenefitPlanInterestCost
Amortization of prior service cost	3us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit		3us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit		0us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Recognized actuarial gain	(4)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses		(4)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses		(5)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Settlements	(1)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1		0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1		0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Net periodic postretirement benefit cost	$ 15us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost		$ 33us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost		$ 19us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Actuarial assumptions used to account for postretirement benefit plans [Abstract]
Weighted-average discount rate (in hundredths)	4.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate		5.05%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate		2.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Assumed healthcare cost trend rates [Abstract]
Assumed healthcare cost trend rate decline (in hundredths)	5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
Assumed healthcare cost trend rate	6.88%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	[1]	7.50%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	[1]	8.00%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	[1]
Year the health care cost trend reaches ultimate rate (year)	2025
[1] The assumed healthcare cost trend rate is assumed to remain at 6.88% for 2015, then decline gradually to 5.00% by 2025 and remain level thereafter.

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- Definition

Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums if they meet minimum levels of service and age requirements set forth by the company or as specified in collective bargaining agreements.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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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 amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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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 interest rate used to adjust for the time value of money for the 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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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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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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