Employee Benefit Plans (Changes In Defined Benefit Obligation And Fair Value Of Defined Benefit Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Remeasurement charge			$ 34
Fair value of plan assets, beginning		2,134	2,134
Fair value of plan assets, ending	2,174		2,236
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning	3,095	2,470	2,470	2,299
Service cost	44	36	71	71	58
Interest cost	61	65	130	120	119
Actuarial loss (gain)	(4)		569	(63)
Employee contributions	1		2	2
Curtailments	(12)
Settlements	(204)
Remeasurement charge			30
Business combinations				36
Benefits paid	(53)		(102)	(90)
Plan amendments			2	(9)
Actual expenses	(1)
Foreign currency effects	27		(77)	104
Benefit obligation, ending	2,954		3,095	2,470	2,299
Fair value of plan assets, beginning	2,236	2,134	2,134	1,721
Actual return on plan assets	161		140	283
Employer contributions	31		123	116
Settlements	(224)
Business combinations				22
Foreign currency effects	23		(61)	80
Fair value of plan assets, ending	2,174		2,236	2,134	1,721
Funded status	(780)		(859)	(336)
Prepaid benefit cost	52		25	51
Accrued benefit liability - current	(14)		(14)	(16)
Accrued benefit liability - long-term	(818)		(870)	(371)
Net amount recognized in the balance sheet	(780)		(859)	(336)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning	305	229	229	224
Service cost	4	3	7	8	9
Interest cost	6	6	12	13	16
Actuarial loss (gain)	7		74	(32)
Remeasurement charge			4
Business combinations				22
Benefits paid	(5)		(8)	(6)
Plan amendments	(109)		(13)
Benefit obligation, ending	208		305	229	224
Employer contributions	5		8	6
Funded status	(208)		(305)	(229)
Accrued benefit liability - current	(13)		(11)	(8)
Accrued benefit liability - long-term	(195)		(294)	(221)
Net amount recognized in the balance sheet	$ (208)		$ (305)	$ (229)