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Long-Term Debt (Schedule of Long Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Aug. 11, 2016
Dec. 31, 2015
Oct. 13, 2015
Debt Instrument [Line Items]        
Senior notes       $ 4,500
Other $ (58)   $ (56)  
Total principal payments 10,478   11,444  
Current portion (332)   (15)  
Long-term debt, excluding current portion 10,146   11,429  
2017 Term Loans [Member]        
Debt Instrument [Line Items]        
Term loans $ 0   1,300  
Applicable margin 1.75%      
2018 Term Loans [Member]        
Debt Instrument [Line Items]        
Term loans $ 550   $ 1,500  
Applicable margin 1.75%      
Weighted average interest rate 1.87%      
Senior Notes due 2017, interest payable semi-annually at 1.450% [Member]        
Debt Instrument [Line Items]        
Interest rate 1.45%   1.45%  
Senior notes $ 300   $ 300  
Senior note redemption price, percentage 100.00%      
Senior Notes due 2018, interest payable semi-annually at 2.000% [Member]        
Debt Instrument [Line Items]        
Interest rate 2.00%   2.00%  
Senior notes $ 250   $ 250  
Senior Notes due October 2018, interest payable semi-annually at 2.850% [Member]        
Debt Instrument [Line Items]        
Interest rate 2.85%   2.85%  
Senior notes $ 750   $ 750  
Senior Notes due 2020, interest payable semi-annually at 3.625% [Member]        
Debt Instrument [Line Items]        
Interest rate 3.625%   3.625%  
Senior notes $ 1,750   $ 1,750  
Senior Notes due 2021, interest payable semi-annually at 2.250% [Member]        
Debt Instrument [Line Items]        
Interest rate 2.25% 2.25% 2.25%  
Senior notes $ 750   $ 0  
Senior Notes due March 2022, interest payable semi-annually at 5.000% [Member]        
Debt Instrument [Line Items]        
Interest rate 5.00%   5.00%  
Senior notes $ 700   $ 700  
Senior Notes due October 2022, interest payable semi-annually at 4.500% [Member]        
Debt Instrument [Line Items]        
Interest rate 4.50%   4.50%  
Senior notes $ 500   $ 500  
Senior Notes due 2023, interest payable semi-annually at 3.500% [Member]        
Debt Instrument [Line Items]        
Interest rate 3.50%   3.50%  
Senior notes $ 1,000   $ 1,000  
Senior Notes due 2024, interest payable semi-annually at 3.875% [Member]        
Debt Instrument [Line Items]        
Interest rate 3.875%   3.875%  
Senior notes $ 700   $ 700  
Senior Notes due 2025, interest payable semi-annually at 5.000% [Member]        
Debt Instrument [Line Items]        
Interest rate 5.00%   5.00%  
Senior notes $ 1,500   $ 1,500  
Senior Notes due 2026, interest payable semi-annually at 3.000% [Member]        
Debt Instrument [Line Items]        
Interest rate 3.00% 3.00% 3.00%  
Senior notes $ 1,250   $ 0  
Senior Notes due 2046, interest payable semi-annually at 4.500% [Member]        
Debt Instrument [Line Items]        
Interest rate 4.50% 4.50% 4.50%  
Senior notes $ 500   $ 0  
Revolving Loan [Member]        
Debt Instrument [Line Items]        
Term loans $ 36   $ 1,250  
Applicable margin 1.75%      
Revolving loan unused commitment fee percentage 0.25%      
Revolving loan marginal rates 1.75%      
Minimum [Member] | Senior Notes due 2018, interest payable semi-annually at 2.000% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due October 2018, interest payable semi-annually at 2.850% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due 2020, interest payable semi-annually at 3.625% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due 2021, interest payable semi-annually at 2.250% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due October 2022, interest payable semi-annually at 4.500% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due 2023, interest payable semi-annually at 3.500% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due 2024, interest payable semi-annually at 3.875% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due 2025, interest payable semi-annually at 5.000% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due 2026, interest payable semi-annually at 3.000% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%      
Minimum [Member] | Senior Notes due 2046, interest payable semi-annually at 4.500% [Member]        
Debt Instrument [Line Items]        
Senior note redemption price, percentage 100.00%