Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Supplemental operating lease cash flow information [Table Text Block]

(dollars in millions)	Quarter Ended March 31, 2019
Operating cash flows for the measurement of operating lease liabilities	$	(145	)
Operating lease right-of-use assets obtained in exchange for operating lease obligations	27

Balance Sheet Location, Operating Leases [Table Text Block]

(dollars in millions, except lease term and discount rate)	March 31, 2019
Operating lease right-of-use assets	$	2,533
Accrued liabilities	$	(582	)
Operating lease liabilities	(2,020		)
Total operating lease liabilities	$	(2,602	)

Supplemental Balance Sheet Information, Operating Leases [Table Text Block]

	March 31, 2019
Weighted Average Remaining Lease Term (in years)	6.9
Weighted Average Discount Rate	3.6	%

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

(dollars in millions)	Operating 1
2019	$	533
2020	540
2021	446
2022	327
2023	242
Thereafter	776
Total undiscounted lease payments	2,864
Less imputed interest	(262		)
Total discounted lease payments	$	2,602