Consolidated Statements of Total Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Comprehensive Income
Shareholders' comprehensive income (loss)	$ 919	$ 654	$ 1,647	$ 1,435
Comprehensive income (loss) attributable to noncontrolling interests:
Net income (loss) attributable to redeemable noncontrolling interests	(1)	(2)	(3)	(3)
Net income (loss) attributable to other noncontrolling interests	(2)	(5)	(5)	(9)
Other comprehensive income (loss) attributable to redeemable noncontrolling interests	2	(1)	0	2
Total comprehensive income (loss) attributable to noncontrolling interests	(1)	(8)	(8)	(10)
Total comprehensive income	$ 918	$ 646	$ 1,639	$ 1,425