Leases (Unaudited) Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lease, Cost [Table Text Block]

Total lease cost is comprised of the following:

$ in millions	Three Months Ended March 31, 2019
Operating lease cost	$	82
Variable lease cost	2
Short-term lease cost	17
Total lease cost	$	101

Supplemental Balance Sheet Disclosures [Text Block]

Supplemental operating lease balance sheet information consists of the following:

$ in millions	March 31, 2019
Operating lease right-of-use assets	$	1,283
Other current liabilities	229
Operating lease liabilities	1,098
Total operating lease liabilities	$	1,327

Other Supplemental Lease Information [Table Text Block]

Other supplemental operating lease information consists of the following:

$ in millions	Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	84
Right-of-use assets obtained in exchange for new lease liabilities	54
Weighted average remaining lease term	11.0 years
Weighted average discount rate	4.0		%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of operating lease liabilities as of March 31, 2019 were as follows:

$ in millions
Year Ending December 31
2019(1)	$	208
2020	260
2021	207
2022	170
2023	134
Thereafter	737
Total lease payments	1,716
Less: imputed interest	(389		)
Present value of operating lease liabilities	$	1,327

⁽¹⁾  Excludes the three months endedMarch 31, 2019.

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

As of December 31, 2018, future minimum lease payments under long-term non-cancelable operating leases as classified under ASC 840 were as follows:

$ in millions
Year Ending December 31
2019	$	312
2020	270
2021	221
2022	186
2023	152
Thereafter	939
Total minimum lease payments	$	2,080