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Fair Value of Financial Instruments (Details) - Fair Value, Inputs, Level 2 [Member]
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
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 value of debt 400
Senior notes due 2017 fair value $ 400
Debt Instrument, Interest Rate 1.85%
Maturity date of debt Nov. 15, 2017
Senior Notes Due 2018 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Face value of debt $ 800
Senior notes due 2018 fair value $ 802
Debt Instrument, Interest Rate 2.05%
Maturity date of debt Oct. 01, 2018
Senior Notes Due 2019 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Face value of debt $ 500
Senior notes due 2019 fair value $ 543
Debt Instrument, Interest Rate 6.25%
Maturity date of debt Sep. 01, 2019
Senior Notes Due 2020 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Face value of debt $ 600
Senior notes due 2020 fair value $ 614
Debt Instrument, Interest Rate 3.00%
Maturity date of debt Dec. 15, 2020
Senior Notes Due 2021 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Face value of debt $ 500
Senior notes due 2022 fair value $ 505
Debt Instrument, Interest Rate 2.80%
Maturity date of debt Dec. 15, 2021
Senior Notes Due 2022 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Face value of debt $ 500
Senior notes due 2025 fair value $ 509
Debt Instrument, Interest Rate 3.125%
Maturity date of debt Nov. 15, 2022
Senior Notes Due 2025 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Face value of debt $ 300
Senior notes due 2025 fair value $ 309
Debt Instrument, Interest Rate 3.85%
Maturity date of debt Dec. 15, 2025
Senior Notes Due 2026 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Face value of debt $ 700
Senior notes due 2025 fair value $ 720
Debt Instrument, Interest Rate 3.80%
Maturity date of debt Dec. 15, 2026