Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

Minimum rental commitments under long-term non-cancelable operating leases as of December 31, 2012, are payable as follows:

$ in millions
Year Ending December 31
2013		$ 274
2014	237
2015	198
2016	157
2017	76
Thereafter	129
Total Minimum Lease Payments		$1,071