Noncontrolling Interests Redeemable Noncontrolling Interests (Rollforward) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Jun. 30, 2014	Dec. 31, 2014	Mar. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling Interests	$ 84	$ 84			$ 1,796
NCI, carrying value, beginning balance	0		0	0
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	62
Reclassification from Permanent Equity	1,500
NCI, carrying value, ending balance	1,386	1,386
Celesio [Member]
Redeemable Noncontrolling Interest [Line Items]
NCI, carrying value, beginning balance	0		0	0
Redeemable NCI, net income	62
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	138
Redeemable NCI, translation adjustments	(105)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent		9	35
Redeemable NCI, purchase of interests	(9)
Reclassification from permanent to temporary equity	1,500			1,500
Reclassification of temporary equity to liability	(62)
Redeemable NCI, other changes	0
NCI, carrying value, ending balance	1,400	1,400
Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interests Excluding Redeemable Noncontrolling Interests	5
Noncontrolling Interests					1,796
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	174
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	60
Reclassification from Permanent Equity	1,500
Reclassification from Equity to Liability	0
Noncontrolling Interests, Changes, Other	$ (17)