Commitments and Contingencies (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Future minimum rental commitments
Rent commitment, 2013	$ 166
Rent commitment, 2014	151
Rent commitment, 2015	138
Rent commitment, 2016	127
Rent commitment, 2017	117
Rent commitment, 2018 and beyond	373
Rent commitment, Total	1,072
Sublease income, 2013	(8)
Sublease income, 2014	(7)
Sublease income, 2015	(8)
Sublease income, 2016	(7)
Sublease income, 2017	(6)
Sublease income, 2018 and beyond	(14)
Sublease income, Total	(50)
Net rent, 2013	158
Net rent, 2014	144
Net rent, 2015	130
Net rent, 2016	120
Net rent, 2017	111
Net rent, 2018 and beyond	359
Net rent, Total	$ 1,022

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Operating Leases Future Minimum Net Payments Due.

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Operating leases future minimum net payments due current.

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Operating leases future minimum net payments due in five years.

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Operating leases future minimum net payments due in four years.

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Operating leases future minimum net payments due in three years.

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Operating leases future minimum net payments due in two years.

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Operating leases future minimum net payments due thereafter.

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Operating leases future minimum sublease income due current.

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Operating leases future minimum sublease income due in four years.

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Operating leases future minimum sublease income due in two years.

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

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Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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