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Debt Senior Unsecured Notes (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 11,619us-gaap_LongTermDebt	$ 11,122us-gaap_LongTermDebt
Senior Unsecured Notes 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt	1,250	1,250
Senior Unsecured Notes 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt	650	0
Senior Unsecured Notes 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	1,550	1,550
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 3,450	$ 2,800

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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