Table:
0
A
B
C
D
1
Business
Consumer
Total
2
(Dollars in millions)
3
As of December 31, 2017(1)
$20,197
10,278
30,475
4
Purchase accounting and other adjustments(2)(3)
250
32
282
5
Impairment
—
(2,726)
(2,726)
6
As of December 31, 2018
$20,447
7,584
28,031

Questions and formulas:
Question: What is the amount of goodwill under Business as a ratio of the Total amount as of December 31, 2018?
Formula: B6/D6
Formula2: B6/D6
Level: Calculation
Question: What is the sum of the total amount of goodwill for 2017 and 2018?
Formula: D3+D6
Formula2: D3+D6
Level: Calculation
Question: What is the average total amount of goodwill for 2017 and 2018?
Formula: (D3+D6)/2
Formula2: (D3+D6)/2
Level: Calculation