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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of components of weighted average number of shares outstanding
Weighted average shares outstanding are as follows (in millions):
Years ended December 31
2017
 
2016
 
2015
Basic weighted-average ordinary shares outstanding
258.5

 
268.1

 
280.8

Dilutive effect of potentially issuable shares
2.2

 
2.2

 
3.0

Diluted weighted-average ordinary shares outstanding
260.7

 
270.3

 
283.8
Components of Accumulated other comprehensive loss, net of related tax
Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):
 
Change in Fair Value of Financial Instruments (1)
 
Foreign Currency Translation Adjustments
 
Postretirement Benefit Obligation (2)
 
Total
Balance at January 1, 2015
$
(17
)
 
$
(335
)
 
$
(2,782
)
 
$
(3,134
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications
(4
)
 
(467
)
 
82

 
(389
)
Tax benefit (expense)
1

 
31

 
(9
)
 
23

Other comprehensive income (loss) before reclassifications, net
(3
)
 
(436
)
 
73

 
(366
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
 
 
Amounts reclassified from accumulated other comprehensive income (loss)
11

 
—

 
117

 
128

Tax benefit (expense)
(16
)
 
—

 
(35
)
 
(51
)
Amounts reclassified from accumulated other comprehensive income (loss), net
(5
)
 
—

 
82

 
77

Net current period other comprehensive income (loss)
(8
)
 
(436
)
 
155

 
(289
)
Balance at December 31, 2015
(25
)
 
(771
)
 
(2,627
)
 
(3,423
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications
(25
)
 
(490
)
 
(276
)
 
(791
)
Tax benefit (expense)
6

 
(3
)
 
74

 
77

Other comprehensive income (loss) before reclassifications, net
(19
)
 
(493
)
 
(202
)
 
(714
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
 

Amounts reclassified from accumulated other comprehensive income (loss)
10

 
—

 
322

 
332

Tax benefit (expense)
(3
)
 
—

 
(104
)
 
(107
)
Amounts reclassified from accumulated other comprehensive income (loss), net
7

 
—

 
218

 
225

Net current period other comprehensive income (loss)
(12
)

(493
)
 
16

 
(489
)
Balance at December 31, 2016
(37
)
 
(1,264
)
 
(2,611
)
 
(3,912
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications
18

 
397

 
(220
)
 
195

Tax benefit (expense)
(3
)
 
(5
)
 
55

 
47

Other comprehensive income (loss) before reclassifications, net
15

 
392

 
(165
)
 
242

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
 

Amounts reclassified from accumulated other comprehensive income (loss)
(2
)
 
(7
)
 
236

 
227

Tax benefit (expense)
(1
)
 
—

 
(52
)
 
(53
)
Amounts reclassified from accumulated other comprehensive income (loss), net
(3
)
 
(7
)
 
184

 
174

Net current period other comprehensive income (loss)
12

 
385

 
19

 
416

Balance at December 31, 2017
$
(25
)
 
$
(879
)
 
$
(2,592
)
 
$
(3,496
)
(1)
Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income (expense), Other general expenses, and Compensation and benefits. See Note 14 “Derivatives and Hedging” for additional information regarding the Company’s derivative and hedging activity.
(2)
Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits