Fair Value Measurements (Major Categories of Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Other current assets	$ 521	$ 435
Other assets	50	464
Other accrued liabilities	46	88
Other liabilities	378	282
Fair Value, Inputs, Level 2 [Member]
Other current assets	227	435
Other assets	50	175
Other accrued liabilities	43	88
Other liabilities	358	282
Fair Value, Inputs, Level 3 [Member]
Other current assets	294
Other assets		$ 289
Other accrued liabilities	3
Other liabilities	20
Contingent consideration	$ 23