Dividends (Tables)

12 Months Ended

Dec. 31, 2017

Dividends, Common Stock [Abstract]

Schedule of dividends declared

Our Board of Directors declared the following dividends payable in 2017 and 2016:

Date Declared	Record Date	Dividend Per Share		Total Amount		Payment Date
				(in millions)
November 14, 2017	11/27/2017	$	0.540	$	577	12/11/2017
August 22, 2017	9/5/2017	0.540		296		9/15/2017
May 24, 2017	6/5/2017	0.540		297		6/16/2017
February 21, 2017	3/3/2017	0.540		295		3/17/2017
November 15, 2016	11/28/2016	0.540		294		12/12/2016
August 23, 2016	9/2/2016	0.540		295		9/16/2016
May 18, 2016	5/31/2016	0.540		294		6/14/2016
February 23, 2016	3/4/2016	0.540		295		3/18/2016