Guarantor Financial Information CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Predecessor [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities		$ 1,235
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment		(1,571)
Payments to Acquire Intangible Assets		(68)
Licensee Reimbursed share of costs		0
Acquisitions, net of cash acquired		(509)
Payments to Acquire Equity Method Investments		(160)
Proceeds from sales and maturities of short-term investments		949
Payments to Acquire Short-term Investments		(295)
Increase (decrease) due from consolidated affiliate from investing activities		0
Payments for (Proceeds from) Other Investing Activities		0
Net Cash Provided by (Used in) Investing Activities		(1,654)
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities		(303)
Debt financing costs		(1)
Proceeds from Issuance of Common Stock		44
Increase (decrease) due from/to consolidated affiliates from financing activities		0
Net cash provided by (used in) financing activities		(260)
Cash and Cash Equivalents, Period Increase (Decrease)		(679)
Cash and cash equivalents, end of period		5,596
Predecessor [Member] | Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities		(356)
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment		0
Payments to Acquire Intangible Assets		0
Acquisitions, net of cash acquired		(509)
Payments to Acquire Equity Method Investments		0
Proceeds from sales and maturities of short-term investments		949
Payments to Acquire Short-term Investments		(295)
Increase (decrease) due from consolidated affiliate from investing activities		(307)
Net Cash Provided by (Used in) Investing Activities		(162)
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities		0
Debt financing costs		(1)
Proceeds from Issuance of Common Stock		44
Increase (decrease) due from/to consolidated affiliates from financing activities		0
Net cash provided by (used in) financing activities		43
Cash and Cash Equivalents, Period Increase (Decrease)		(475)
Cash and cash equivalents, end of period		4,649
Predecessor [Member] | Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities		1,591
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment		(1,571)
Payments to Acquire Intangible Assets		(68)
Acquisitions, net of cash acquired		0
Payments to Acquire Equity Method Investments		(160)
Proceeds from sales and maturities of short-term investments		0
Payments to Acquire Short-term Investments		0
Increase (decrease) due from consolidated affiliate from investing activities		0
Net Cash Provided by (Used in) Investing Activities		(1,799)
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities		(303)
Debt financing costs		0
Proceeds from Issuance of Common Stock		0
Increase (decrease) due from/to consolidated affiliates from financing activities		307
Net cash provided by (used in) financing activities		4
Cash and Cash Equivalents, Period Increase (Decrease)		(204)
Cash and cash equivalents, end of period		947
Predecessor [Member] | Consolidation, Eliminations [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities		0
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment		0
Payments to Acquire Intangible Assets		0
Acquisitions, net of cash acquired		0
Payments to Acquire Equity Method Investments		0
Proceeds from sales and maturities of short-term investments		0
Payments to Acquire Short-term Investments		0
Increase (decrease) due from consolidated affiliate from investing activities		307
Net Cash Provided by (Used in) Investing Activities		307
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities		0
Debt financing costs		0
Proceeds from Issuance of Common Stock		0
Increase (decrease) due from/to consolidated affiliates from financing activities		(307)
Net cash provided by (used in) financing activities		(307)
Cash and Cash Equivalents, Period Increase (Decrease)		0
Cash and cash equivalents, end of period		0
Successor [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities	679	8
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment	(1,246)	0
Payments to Acquire Intangible Assets	(41)	0
Licensee Reimbursed share of costs	95	0
Acquisitions, net of cash acquired	0	0
Payments to Acquire Equity Method Investments	0	0
Proceeds from sales and maturities of short-term investments	900	0
Payments to Acquire Short-term Investments	(1,002)	0
Increase (decrease) due from consolidated affiliate from investing activities	0
Payments for (Proceeds from) Other Investing Activities	17	0
Net Cash Provided by (Used in) Investing Activities	(1,277)	0
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(210)	0
Debt financing costs	0	0
Proceeds from Issuance of Common Stock	9
Increase (decrease) due from/to consolidated affiliates from financing activities	0
Net cash provided by (used in) financing activities	(201)	0
Cash and Cash Equivalents, Period Increase (Decrease)	(799)	8
Cash and cash equivalents, end of period	4,171	11
Successor [Member] | Parent Company [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities	0
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment	0
Payments to Acquire Intangible Assets	0
Licensee Reimbursed share of costs	0
Proceeds from sales and maturities of short-term investments	0
Payments to Acquire Short-term Investments	0
Increase (decrease) due from consolidated affiliate from investing activities	0
Payments for (Proceeds from) Other Investing Activities	0
Net Cash Provided by (Used in) Investing Activities	0
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	0
Proceeds from Issuance of Common Stock	0
Increase (decrease) due from/to consolidated affiliates from financing activities	0
Net cash provided by (used in) financing activities	0
Cash and Cash Equivalents, Period Increase (Decrease)	0
Cash and cash equivalents, end of period	0
Successor [Member] | Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities	(429)
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment	0
Payments to Acquire Intangible Assets	0
Licensee Reimbursed share of costs	0
Proceeds from sales and maturities of short-term investments	900
Payments to Acquire Short-term Investments	(1,002)
Increase (decrease) due from consolidated affiliate from investing activities	(58)
Payments for (Proceeds from) Other Investing Activities	0
Net Cash Provided by (Used in) Investing Activities	(160)
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	0
Proceeds from Issuance of Common Stock	9
Increase (decrease) due from/to consolidated affiliates from financing activities	0
Net cash provided by (used in) financing activities	9
Cash and Cash Equivalents, Period Increase (Decrease)	(580)
Cash and cash equivalents, end of period	3,545
Successor [Member] | Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities	1,108
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment	(1,246)
Payments to Acquire Intangible Assets	(41)
Licensee Reimbursed share of costs	95
Proceeds from sales and maturities of short-term investments	0
Payments to Acquire Short-term Investments	0
Increase (decrease) due from consolidated affiliate from investing activities	0
Payments for (Proceeds from) Other Investing Activities	17
Net Cash Provided by (Used in) Investing Activities	(1,175)
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(210)
Proceeds from Issuance of Common Stock	0
Increase (decrease) due from/to consolidated affiliates from financing activities	58
Net cash provided by (used in) financing activities	(152)
Cash and Cash Equivalents, Period Increase (Decrease)	(219)
Cash and cash equivalents, end of period	626
Successor [Member] | Consolidation, Eliminations [Member]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities	0
Cash flows from investing activities
Payments to Acquire Property, Plant, and Equipment	0
Payments to Acquire Intangible Assets	0
Licensee Reimbursed share of costs	0
Proceeds from sales and maturities of short-term investments	0
Payments to Acquire Short-term Investments	0
Increase (decrease) due from consolidated affiliate from investing activities	58
Payments for (Proceeds from) Other Investing Activities	0
Net Cash Provided by (Used in) Investing Activities	58
Cash flows from financing activities
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	0
Proceeds from Issuance of Common Stock	0
Increase (decrease) due from/to consolidated affiliates from financing activities	(58)
Net cash provided by (used in) financing activities	(58)
Cash and Cash Equivalents, Period Increase (Decrease)	0
Cash and cash equivalents, end of period	$ 0