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Fair Value (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fixed rate senior notes carrying amount | $ 4,300
Senior notes due 2017 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 400
Senior notes due 2017 fair value | 401
Senior notes due 2018 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 800
Senior notes due 2018 fair value | 803
Senior notes due 2019 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 500
Senior notes due 2019 fair value | 551
Senior notes due 2020 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 600
Senior notes due 2020 fair value | 605
Senior notes due 2021 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 500
Senior notes due 2021 fair value | 497
Senior notes due 2022 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 500
Senior notes due 2022 fair value | 497
Senior notes due 2025 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 300
Senior notes due 2025 fair value | 303
Senior notes due 2026 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Face amount of debt | 700
Senior notes due 2026 fair value | $ 702

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