Table:
0
A
B
C
D
1
(dollars in millions)
2
2019
2018
2017
3
Balance at January 1,
$ 2,871
$2,355
$ 1,902
4
Additions based on tax positions related to the current year
149
160
219
5
Additions for tax positions of prior years
297
699
756
6
Reductions for tax positions of prior years
(300)
(248)
(419)
7
Settlements
(58)
(40)
(42)
8
Lapses of statutes of limitations
(89)
(55)
(61)
9
Balance at December 31,
$ 2,870
$ 2,871
$ 2,355

Questions and formulas:
Question: What was the change in the Additions based on tax positions related to the current year from 2018 to 2019?
Formula: B4 - C4
Formula2: B4 - C4
Level: Calculation
Question: What was the average Additions for tax positions of prior years for 2017-2019?
Formula: (B5 + C5 + D5) / 3
Formula2: (B5 + C5 + D5) / 3
Level: Calculation
Question: What was the average settlements for 2017-2019?
Formula: (B7 + C7 +D7) / 3
Formula2: (B7 + C7 +D7) / 3
Level: Calculation