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Subsequent Events (Tables)
3 Months Ended
Mar. 31, 2019
Debt Redemptions/Repayments [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
(in millions)
Amount
4.625% Notes due 2020
$
474

3.625% Notes due 2021
296

4.250% Notes due 2021
163

2.800% Notes due 2023
381

6.500% Debentures due 2028
57

5.600% Senior Notes due 2036
42

4.900% Notes due 2041
48

4.150% Notes due 2043
69

Total
$
1,530