Shareholders' Equity and Comprehensive Earnings - AOCI Activity (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of the period	$ 1,261
Balance at end of the period	3,834
Foreign Currency Translation.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of the period	(183)
Other comprehensive earnings (loss) before reclassifications	(1)
Balance at end of the period	(184)
Effective Derivatives (Net of Tax)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of the period	(12)
Other comprehensive earnings (loss) before reclassifications	(3)
Amounts reclassified from accumulated other comprehensive earnings (loss)	13
Balance at end of the period	(2)
Pension and Other Postretirement Benefits (Net of Tax)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of the period	(445)
Other comprehensive earnings (loss) before reclassifications	(33)
Amounts reclassified from accumulated other comprehensive earnings (loss)	71
Balance at end of the period	(407)
Accumulated Other Comprehensive Earnings (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance at beginning of the period	(640)
Other comprehensive earnings (loss) before reclassifications	(37)
Amounts reclassified from accumulated other comprehensive earnings (loss)	84
Balance at end of the period	(593)
Divestment Business
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Amount of loss, net of tax, from plans transferred in the Divestment Business included in amounts reclassified from AOCI	$ (60)