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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Schedule of components of weighted average number of shares outstanding
Weighted average shares outstanding are as follows (in millions):
 
Year ended December 31,
 
2016
 
2015
 
2014
Basic weighted-average ordinary shares outstanding
268.1

 
280.8

 
295.5

Dilutive effect of potentially issuable shares
2.2

 
3.0

 
4.1

Diluted weighted-average ordinary shares outstanding
270.3

 
283.8

 
299.6
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
 
Post-Retirement Benefit Obligation (2)
 
Total
Balance at January 1, 2014
$
(21
)
 
$
169

 
$
(2,522
)
 
$
(2,374
)
Other comprehensive loss before reclassifications:
 
 
 
 
 
 
 
Other comprehensive loss before reclassifications
(13
)
 
(492
)
 
(563
)
 
(1,068
)
Tax benefit
4

 
(12
)
 
229

 
221

Other comprehensive loss before reclassifications, net
(9
)
 
(504
)
 
(334
)
 
(847
)
Amounts reclassified from accumulated other comprehensive loss:
 
 
 
 
 
 
 
Amounts reclassified from accumulated other comprehensive loss
20

 
—

 
106

 
126

Tax benefit
(7
)
 
—

 
(32
)
 
(39
)
Amounts reclassified from accumulated other comprehensive loss, net
13

 
—

 
74

 
87

Net current period other comprehensive (loss) income
4

 
(504
)
 
(260
)
 
(760
)
Balance at December 31, 2014
(17
)
 
(335
)
 
(2,782
)
 
(3,134
)
Other comprehensive loss before reclassifications:
 
 
 
 
 
 
 
Other comprehensive loss before reclassifications
(4
)
 
(467
)
 
82

 
(389
)
Tax benefit
1

 
31

 
(9
)
 
23

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

 
(366
)
Amounts reclassified from accumulated other comprehensive loss:
 
 
 
 
 
 

Amounts reclassified from accumulated other comprehensive loss
11

 
—

 
117

 
128

Tax benefit
(16
)
 
—

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

 
82

 
77

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

(436
)
 
155

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

 
(3
)
 
74

 
77

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

Amounts reclassified from accumulated other comprehensive loss
10

 
—

 
322

 
332

Tax benefit
(3
)
 
—

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

 
—

 
218

 
225

Net current period other comprehensive (loss) income
(12
)
 
(493
)
 
16

 
(489
)
Balance at December 31, 2016
$
(37
)
 
$
(1,264
)
 
$
(2,611
)
 
$
(3,912
)

(1)
Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income
(2)
Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits