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Stockholders' Equity (Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 5,674 $ 5,796 $ 5,034
Unrealized actuarial gain(loss) and prior service credit (cost) 70 79 233
Tax effect (37) 30 80
Other comprehensive income (loss), net of tax (68) (501) (546)
Ending balance 5,728 5,674 5,796
Foreign Currency      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (1,348) (925) (532)
Unrealized gain (loss) (30) (432) (392)
Unrealized actuarial gain(loss) and prior service credit (cost) 0 0 0
Tax effect (17) 0 (5)
Other comprehensive income (loss), net of tax (47) (432) (397)
Less: Other comprehensive loss available to noncontrolling interests 0 (9) (4)
Other comprehensive income (loss), net of tax (47) (423) (393)
Ending balance (1,395) (1,348) (925)
Derivative Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (30) (7) (6)
Unrealized gain (loss) 71 (23) (1)
Unrealized actuarial gain(loss) and prior service credit (cost) 0 0 0
Tax effect (26) 0 0
Other comprehensive income (loss), net of tax 45 (23) (1)
Less: Other comprehensive loss available to noncontrolling interests 0 0 0
Other comprehensive income (loss), net of tax 45 (23) (1)
Ending balance 15 (30) (7)
Pension and Postretirement Liability      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (967) (918) (770)
Unrealized gain (loss) 0 0 0
Unrealized actuarial gain(loss) and prior service credit (cost) 70 79 233
Tax effect 6 30 85
Other comprehensive income (loss), net of tax (64) (49) (148)
Less: Other comprehensive loss available to noncontrolling interests 0 0 0
Other comprehensive income (loss), net of tax (64) (49) (148)
Ending balance (1,031) (967) (918)
Marketable Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 13 10 10
Unrealized gain (loss) (2) 3 0
Unrealized actuarial gain(loss) and prior service credit (cost) 0 0 0
Tax effect 0 0 0
Other comprehensive income (loss), net of tax (2) 3 0
Less: Other comprehensive loss available to noncontrolling interests 0 0 0
Other comprehensive income (loss), net of tax (2) 3 0
Ending balance 11 13 10
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (2,332) (1,840) (1,298)
Unrealized gain (loss) 39 (452) (393)
Unrealized actuarial gain(loss) and prior service credit (cost) 70 79 233
Tax effect (37) 30 80
Other comprehensive income (loss), net of tax (68) (501) (546)
Less: Other comprehensive loss available to noncontrolling interests 0 (9) (4)
Other comprehensive income (loss), net of tax (68) (492) (542)
Ending balance $ (2,400) $ (2,332) $ (1,840)