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Fair Value of Financial Instruments (Details) - Fair Value, Inputs, Level 2
Jun. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fixed rate senior notes carrying amount $ 3,900,000,000
$800 2.050% senior notes due 2018  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, fair value 799,000,000
Face value of debt $ 800,000,000
Interest rate on senior notes 2.05%
$500 6.250% senior notes due 2019  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, fair value $ 518,000,000
Face value of debt $ 500,000,000
Interest rate on senior notes 6.25%
$600 3.000% senior notes due 2020  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, fair value $ 596,000,000
Face value of debt $ 600,000,000
Interest rate on senior notes 3.00%
$500 2.800% senior notes due 2021  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, fair value $ 489,000,000
Face value of debt $ 500,000,000
Interest rate on senior notes 2.80%
$500 3.125% senior notes due 2022  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, fair value $ 492,000,000
Face value of debt $ 500,000,000
Interest rate on senior notes 3.125%
$300 3.850% senior notes due 2025  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, fair value $ 296,000,000
Face value of debt $ 300,000,000
Interest rate on senior notes 3.85%
$700 3.800% senior notes due 2026  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, fair value $ 681,000,000
Face value of debt $ 700,000,000
Interest rate on senior notes 3.80%