Commitments and Contingencies - Material Contractual Obligations, Commercial Commitments and Outstanding Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Commitment And Contingencies [Line Items]
Operating leases, Total	$ 114
Operating leases, Less than 1 year	19
Operating leases, 1 to 3 years	27
Operating leases, 3 to 5 years	26
Operating leases, More than 5 years	42
Contractual Obligation, Total	266us-gaap_ContractualObligation
Contractual Obligation, Less than 1 year	25
Contractual Obligation, 1 to 3 years	49
Contractual Obligation, 3 to 5 years	44
Contractual Obligation, More than 5 years	148
Build to Suit Lease Obligation
Commitment And Contingencies [Line Items]
Contractual Obligation, Total	143
Contractual Obligation, Less than 1 year	1
Contractual Obligation, 1 to 3 years	18
Contractual Obligation, 3 to 5 years	18
Contractual Obligation, More than 5 years	106
Expected Interest Payments on Term Loan
Commitment And Contingencies [Line Items]
Contractual Obligation, Total	9
Contractual Obligation, Less than 1 year	5
Contractual Obligation, 1 to 3 years	$ 4

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Operating leases future minimum payments due within one to three year.

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Operating leases future minimum payments due within three to five year.

+ References

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- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

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- Definition

Amount of contractual obligation maturing after the fifth fiscal year following the latest fiscal year.

+ References

No definition available.

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Amount of contractual obligation maturing in the fourth and fifth fiscal years following the latest fiscal year.

+ References

No definition available.

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- Definition

Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year.

+ References

No definition available.

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- Definition

Amount of contractual obligation maturing in the second and third fiscal years following the latest fiscal year.

+ References

No definition available.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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.

+ References

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