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Subsequent Event Subsequent Event	6 Months Ended
Subsequent Event Subsequent Event	Jun. 30, 2018
Subsequent Event [Abstract]
Subsequent Events [Text Block]	Subsequent Event In July 2018, the Board of Directors authorized a $1.0 billion share repurchase program (exclusive of any commissions and other transaction fees and costs). This program replaces the $245 of authority remaining under the Company's previously authorized share repurchase program.