Contingencies and commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Minimum future rental commitments under non-cancelable operating leases

The following table summarizes the minimum future rental commitments under noncancelable operating leases as of December 31, 2017 (in millions):

	Amount
2018	$	158
2019	126
2020	116
2021	100
2022	59
Thereafter	91
Total minimum operating lease commitments	$	650

U.S. repatriation tax commitments

Under the 2017 Tax Act, we will elect to pay the repatriation tax primarily related to our prior indefinitely invested earnings of our foreign operations in eight annual installments beginning in April 2018. See Note 5, Income taxes. As of December 31, 2017, we expect to pay $7.3 billion in repatriation taxes during the following years (in millions):

	Amount
2018	$	585
2019	585
2020	585
2021	585
2022	585
Thereafter	4,391
Total U.S. repatriation tax commitments	$	7,316