Shareholders' Equity (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period			$ (450)
Other comprehensive income (loss)	465	(739)	384	115	(1,089)	1,075
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(450)		(57)	(450)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			131
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period			136
Net realized gains (losses)			0
Other Comprehensive Income (Loss), Tax			2
Other comprehensive income (loss)			133
Balance of Accumulated Other Comprehensive Income (Loss) at End of period			269
Deferred Gain (Loss) On Hedging Activities [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(35)
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period			4
Net realized gains (losses)			37
Other Comprehensive Income (Loss), Tax			(1)
Other comprehensive income (loss)			1
Balance of Accumulated Other Comprehensive Income (Loss) at End of period			5
Pension Liability Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			354
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period			(590)
Net realized gains (losses)			60
Other Comprehensive Income (Loss), Tax			(154)
Other comprehensive income (loss)			260
Balance of Accumulated Other Comprehensive Income (Loss) at End of period			(330)
Unrealized Gain (Loss) On Investments [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(157)
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period			0
Net realized gains (losses)			157
Other Comprehensive Income (Loss), Tax			(1)
Other comprehensive income (loss)			(1)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period			(1)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax			293
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period			(450)
Net realized gains (losses)			254
Other Comprehensive Income (Loss), Tax			(154)
Other comprehensive income (loss)	457		393		(1,083)	1,075
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	$ (450)		$ (57)	$ (450)