Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 are payable as follows:

$ in millions
Year Ending December 31
2017	$	257
2018	186
2019	131
2020	92
2021	66
Thereafter	160
Total minimum lease payments	$	892