CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions			9 Months Ended
	Oct. 16, 2017	Sep. 15, 2017	Sep. 30, 2017
Net cumulative-effect adjustment			$ 59
Common stock, date dividend to be paid		Oct. 16, 2017	Oct. 16, 2017
Subsequent Event [Member]
Common stock, shares issued as stock dividend	3,346,703