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Long-Term Debt - (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 15, 2017
Long-Term Debt      
Other $ 13 $ (58)  
Total long-term debt 9,505 10,478  
Current portion (351) (332)  
Long-term debt, excluding current portion 9,154 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 $ 300 $ 300  
Debt instrument, stated percentage 1.45% 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% 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% 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% 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% 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% 5.00% 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% 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% 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% 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% 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% 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% 4.50%  
Revolving Loan      
Long-Term Debt      
Loans $ 242 $ 36  
Unused commitment fee 0.25% 0.25%  
Weighted average interest rate 2.17%    
One month LIBOR | Maximum | 2018 Term Loans      
Long-Term Debt      
Applicable margin 1.75% 1.75%  
One month LIBOR | Maximum | Revolving Loan      
Long-Term Debt      
Applicable margin 1.75% 1.75%