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Long-Term Debt - (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Long-Term Debt    
Other $ 12 $ (58)
Total long-term debt 9,712 10,478
Current portion (297) (332)
Long-term debt, excluding current portion 9,415 10,146
2018 Term Loans    
Long-Term Debt    
Loans 0 550
Senior Notes due June 2017, interest payable semi-annually at 1.450%    
Long-Term Debt    
Senior notes 0 $ 300
Debt instrument, stated percentage   1.45%
Senior Notes due April 2018, interest payable semi-annually at 2.000%    
Long-Term Debt    
Senior notes $ 250 $ 250
Debt instrument, stated percentage 2.00%  
Senior Notes due October 2018, interest payable semi-annually at 2.850%    
Long-Term Debt    
Senior notes $ 750 750
Debt instrument, stated percentage 2.85%  
Senior Notes due October 2020, interest payable semi-annually at 3.625%    
Long-Term Debt    
Senior notes $ 1,750 1,750
Debt instrument, stated percentage 3.625%  
Senior Notes due August 2021, interest payable semi-annually at 2.250%    
Long-Term Debt    
Senior notes $ 750 750
Debt instrument, stated percentage 2.25%  
Senior Notes due March 2022, interest payable semi-annually at 5.000%    
Long-Term Debt    
Senior notes $ 0 $ 700
Debt instrument, stated percentage   5.00%
Senior Notes due October 2022, interest payable semi-annually at 4.500%    
Long-Term Debt    
Senior notes $ 500 $ 500
Debt instrument, stated percentage 4.50%  
Senior Notes due April 2023, interest payable semi-annually at 3.500%    
Long-Term Debt    
Senior notes $ 1,000 1,000
Debt instrument, stated percentage 3.50%  
Senior Notes due June 2024, interest payable semi-annually at 3.875%    
Long-Term Debt    
Senior notes $ 700 700
Debt instrument, stated percentage 3.875%  
Senior Notes due October 2025, interest payable semi-annually at 5.000%    
Long-Term Debt    
Senior notes $ 1,500 1,500
Debt instrument, stated percentage 5.00%  
Senior Notes due August 2026, interest payable semi-annually at 3.000%    
Long-Term Debt    
Senior notes $ 1,250 1,250
Debt instrument, stated percentage 3.00%  
Senior Notes due August 2046, interest payable semi-annually at 4.500%    
Long-Term Debt    
Senior notes $ 500 500
Debt instrument, stated percentage 4.50%  
Revolving Loan    
Long-Term Debt    
Loans $ 750 $ 36
Unused commitment fee 0.25%  
Weighted average interest rate 2.44%  
One month LIBOR | Maximum | 2018 Term Loans    
Long-Term Debt    
Applicable margin 1.75%  
One month LIBOR | Maximum | Revolving Loan    
Long-Term Debt    
Applicable margin 1.75%