Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Table Text Block]

A summary of property, equipment and capitalized software is as follows:

(in millions)	December 31, 2017			December 31, 2016
Land and improvements	$	405		$	324
Buildings and improvements	3,664			3,148
Computer equipment	1,829			2,021
Furniture and fixtures	1,208			999
Less accumulated depreciation	(2,488		)	(2,621		)
Property and equipment, net	4,618			3,871
Capitalized software	3,601			3,158
Less accumulated amortization	(1,206		)	(1,128		)
Capitalized software, net	2,395			2,030
Total property, equipment and capitalized software, net	$	7,013		$	5,901

Redeemable Noncontrolling Interest [Table Text Block]

The following table provides details of the Company's redeemable noncontrolling interests’ activity for the years ended December 31, 2017 and 2016:

(in millions)	2017			2016
Redeemable noncontrolling interests, beginning of period	$	2,012		$	1,736
Net earnings	71			16
Acquisitions	565			34
Redemptions	(309		)	(123		)
Distributions	(38		)	(11		)
Fair value and other adjustments	(112		)	360
Redeemable noncontrolling interests, end of period	$	2,189		$	2,012

Useful Life [Member]

Property, Plant and Equipment [Table Text Block]

The Company calculates depreciation and amortization using the straight-line method over the estimated useful lives of the assets. The useful lives for property, equipment and capitalized software are:

Furniture, fixtures and equipment	3 to 10 years
Buildings	35 to 40 years
Capitalized software	3 to 5 years